@curiousmarc CuriousMarc
CuriousMarc posts on YouTube about retro, in the, $5201t, stuff the most. They currently have [-------] followers and [---] posts still getting attention that total [------] engagements in the last [--] hours.
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Social Influence
Social category influence technology brands stocks finance social networks countries products cryptocurrencies gaming currencies
Social topic influence retro #692, in the, $5201t #10, stuff, channel, atomic, micro, ibm, comms, core
Top accounts mentioned or mentioned by @uc4kz0sexsqnkfi7w1pbkymg @heybirt @uc3bosur3wlkym4sbalsadw @tubetimeus @emsl @franlab @teletweety @aljawad @morleykert @evilmonkeyzdesignz @davepl
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Top Social Posts
Top posts by engagements in the last [--] hours
"Apollo Guidance Computer Part 1: Restoring the computer that put man on the Moon We embark on the restoration of a very rare and historically significant machine: the Apollo Guidance Computer or AGC. It was the revolutionary MIT-designed computer aboard Apollo that brought man on the Moon (and back). Mike Stewart space engineer extraordinaire and living AGC encyclopedia spearheads this restoration effort. In this first episode we setup a makeshift lab in his hotel room somewhere in Houston. The computer belongs to a delightful private collector Jimmie Loocke who has generously allowed us to"
YouTube Link 2018-11-14T05:17Z 238K followers, 583.4K engagements
"Apollo Comms Part 38: Return of the AGC (we hook up our Apollo Guidance Computer to our comms setup) We hook up the AGC to our communications setup and it starts sending data back to earth. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to schematics: CSM [---] Systems Handbook: https://www.ibiblio.org/apollo/Documents/HSI-481260.pdf CSM Functional Integrated Schematics Block II rev. K: https://www.ibiblio.org/apollo/Documents/CSM%20Functional%20Integrated%20System%20Schematics%20Block%20II%20Revision%20K.pdf Links to more doc:"
YouTube Link 2026-02-15T06:03Z 238K followers, 33.5K engagements
"Apollo Comms Part 36: PCM pinout discovery saved by "SCE to AUX" We need to figure out where over [---] inputs should hook up to our Apollo PCM Telemetry box. Little did we know the SCE of "switch SCE to AUX" fame on Apollo [--] will save our butts once again. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to schematics: CSM [---] Systems Handbook: https://www.ibiblio.org/apollo/Documents/HSI-481260.pdf CSM Functional Integrated Schematics Block II rev. K:"
YouTube Link 2025-12-10T07:00Z 238K followers, 57K engagements
"ASR [--] Teletype demo (restoration Part 10) Our 8-bit ASR [--] Teletype is finally restored. Let's give it a whirl ASR [--] Teletype restoration playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5-84G5kmgfuu7TQduTMc73H Our sponsor for PCBs: https://www.pcbway.com Support the team on Patreon: https://www.patreon.com/curiousmarc Buy shirts on Teespring: https://teespring.com/stores/curiousmarcs-store Learn more on companion site: https://www.curiousmarc.com Contact info: https://www.youtube.com/curiousmarc/about CuriousMarc Teletype Restoration ASR [--] [--] ASR Retro Computing Vintage Computing"
YouTube Link 2020-02-05T18:07Z 238K followers, 76.6K engagements
"Apollo Comms Part 35: PCM Telemetry - Power Up We look inside and power up the Apollo command module PCM Telemetry box which provided the telemetry downlink for the Apollo missions. PCM stands for Pulse Code Modulation and was entirely digital in contrast to the analog FM telemetry prevalent at the time. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to schematics: CSM [---] Systems Handbook: https://www.ibiblio.org/apollo/Documents/HSI-481260.pdf CSM Functional Integrated Schematics Block II rev. K:"
YouTube Link 2025-09-21T01:00Z 238K followers, 115.7K engagements
"Apollo [--] accident: understanding Houstons real time debug (Apollo Comms Part 28) We open up a Block I Apollo AC inverter which gets us totally sidetracked into the Apollo [--] incident. Using the original schematics looking how our inverter was hooked up in the power system we can follow word for word the Apollo [--] raw audio of the debug after the accident. I will go into much more engineering details than what is usually reported but once you understand this the flight control loops become both limpid and downright chilling. And then when we regain our composure and get back to said inverter"
YouTube Link 2023-06-02T23:49Z 238K followers, 266.9K engagements
"Converting a Military TA-1024A/U Field Telephone for Regular Phone Use How to convert the very cool TA-1024A/U digital military field phone for regular civilian use. Warning for sensitive souls: beautiful digital military electronics that cant be used get replaced with cheap analog consumer innards that can be used. Warning for sensitive hears: my new mic cable picked up an awful [----] kHz high pitch whine which I traced back to the LCD screen on my camera using an antique NTSC interface (15.7 kHz is the line rate of NTSC). How ironic for a retro tech channel. Sorry can't fix the sound now"
YouTube Link 2019-04-22T09:29Z 238K followers, 177.6K engagements
"Apollo Guidance Computer Part 26: We open and identify the AGC for sale at the upcoming auction An AGC and a DSKY are going to be offered at a web auction in a few days. This is the first time an AGC is offered in a public auction. We got a chance to inspect it closely before the big day. Watch the auction (or better bid on it) on Oct. 11-16 [----] at https://www.rrauction.com CuriousMarc Moon Landing AGC Apollo Guidance Computer Vintage Computer Restoration MIT Museum Don Eyles Core Rope RR Auction Auction for sale DSKY LTA-8 Inspection Idenditification CuriousMarc Moon Landing AGC Apollo"
YouTube Link 2019-10-08T08:34Z 238K followers, 71K engagements
"Apollo Guidance Computer Part 24: the restored AGC does Moon landings in front of its creators Our AGC is restored just in time for the 50th anniversary of the lunar landing. It goes on tour featured at several celebration events on the East Coast where it meets some of its original creators. And we fly Apollo [--] Moon landings with it. Some relevant links: Playlist of the restoration series: https://www.youtube.com/playlistlist=PL-_93BVApb59FWrLZfdlisi_x7-Ut_-w7 Block I AGC period documentary: https://youtu.be/ndvmFlg1WmE Inertial navigation system documentary: https://youtu.be/wD97RSpiZe0"
YouTube Link 2019-07-27T17:58Z 238K followers, 146.8K engagements
"Apollo Comms Part 37: Apollo's weirdest (but genius) analog circuit In this brain numbing episode we explore a genius circuit that defies our modern understanding of analog electronics. It's the analog multiplexer used in the Apollo telemetry box that we recently hooked up. After we build it not only does it work great but it teaches us a few things Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to schematics: CSM [---] Systems Handbook: https://www.ibiblio.org/apollo/Documents/HSI-481260.pdf CSM Functional Integrated Schematics"
YouTube Link 2026-01-04T06:15Z 238K followers, 179.1K engagements
"Titan missile in silo Decommissioned Titan II nuclear missile in its silo. This is the largest nuclear missile ever made by the US during the cold war. [--] of these monsters were ready to be launched in less than a minute. Thanks goodness we never launched any and they were decommissioned. Most ended up being used by NASA for launching satellites and more importantly the later Gemini missions. The silos were destroyed after the SALT agreement and this is the only preserved one at the Titan Missile Museum in Tucson AZ. CuriousMarc Vintage Tech Retro Computing Restoration Electronic Repairs"
YouTube Link 2025-10-20T18:51Z 238K followers, 38.2K engagements
"How an Atomic Clock Really Works: Inside the HP 5061A Cesium Clock I finally get my hands on what I consider a holy instrument: the HP 5061A Cesium clock. We'll turn it on and play with it of course but I'll also explain how it works in more details than most videos both the quantum physics principle and the HP implementation. What makes it tick is just mind blowing. See continuation in part [--] here: https://youtu.be/xTy1kY_wtsY Atomic clock playlist: https://youtube.com/playlistlist=PL-_93BVApb59F6V90OdcqVofqVWceR6Dk Cody's Lab Cesium video: https://youtu.be/rSJGwnERIVU Our sponsor for PCBs:"
YouTube Link 2020-03-20T07:04Z 238K followers, 459K engagements
"Core Memory Explained and Demonstrated Ferrite core memory was the dominant computer memory technology from the 1950s to the late 1970s. Before we delve into the repair of our Apollo AGC core memory I thought it would be good to explain how they work as they are very different from modern semiconductor memory. Check out our Russian core memory follow up video here: https://www.youtube.com/watchv=7ozNMgx7WtQ Ken Shirriff has some of the best core memory write ups I know of here: http://www.righto.com/2015/08/examining-core-memory-module-inside.html This one details the AGC core memory:"
YouTube Link 2019-02-17T09:28Z 238K followers, 305.8K engagements
"Running Microsoft's first product on the Altair [----] from paper tape We run Microsofts' first product: MITS BASIC for the Altair [----]. It is as hard core as it is genius. You really had to be a visionary to perceive that this was going to be the future of computing. Bill Gates' interview at the Computer History Museum: https://youtu.be/CZEW2P4DBl0 Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2025-02-19T09:00Z 238K followers, 135K engagements
"MMD-1 8-bit microprocessor lab breadboarding system #vintage #retro #8bit The E&L Industries MMD-1 was a lab breadboarding system based on the Intel [----] microprocessor released in May [----]. I added the gorgeous vintage LED displays on the breadboard they are HP 5082-7340. CuriousMarc Vintage Tech Retro Computing Restoration Electronic Repairs CuriousMarc Vintage Tech Retro Computing Restoration Electronic Repairs"
YouTube Link 2025-03-19T07:09Z 238K followers, 24K engagements
"Flying the Apollo [--] Moon Landing with the Original AGC Code (Apollo Guidance Computer Part 23) We fly the Apollo [--] landing to a high degree of fidelity with the simulated LM guided by a real AGC running the original Apollo [--] flight software. Mike has hooked the AGC to a LM simulation from the Orbiter/NASSP program which is a very accurate simulation. Just as back then it requires piloting skill and nerves of steel. We fly two landings in this video: the first one is a "nominal" Apollo landing to explain things. The second one is a hair raising Apollo [--] re-enactment landing with 1202"
YouTube Link 2019-07-17T23:56Z 238K followers, 414.4K engagements
"The IBM [----] compiles and runs FORTRAN II We attempt to compile and run a simple FORTRAN program on our vintage [----] IBM mainframe computer at the Computer History Museum. FORTRAN is a big stretch for this business oriented machine with 16k memory and a CPU not meant at all for scientific applications. Even integer multiply and divide instructions are an optional feature on the base machine Success not guaranteed. Come see the IBM [----] computer at the Computer History Museum in Mountain View California USA: https://computerhistory.org/exhibits/ibm1401/ Simulation and programming environment"
YouTube Link 2018-02-02T20:39Z 238K followers, 1.3M engagements
"Apollo Comms Part 10: Apollo SDR reboot and first voice transmission We use an SDR radio to talk to our Apollo transponder. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Balint and Austin ISEE-3 Reboot SDR presentation: https://www.youtube.com/watchv=NTljlMH-0oM Links to doc: https://www.curiousmarc.com/space/apollo-s-band-communications https://virtualagc.github.io/virtualagc/QuestForInfo.html https://www.ibiblio.org/apollo/ Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - Keysight: test instruments:"
YouTube Link 2022-02-17T07:29Z 238K followers, 64.5K engagements
"Apollo Comms Part 1: Opening the S-Band Transponder and Amplifier We open the microwave transponder and amplifier that brought you TV from the Moon and explain the Apollo Unified S-Band telecommunications. 00:00 Intro pick up of the boxes at Steve Jurvetson's 00:54 Apollo's space comm technology legacy 02:38 Weighing the boxes 03:45 United S-Band system explanation 09:06 Opening the boxes 10:07 Amplifier reveal 11:10 Transponder reveal 12:23 Beauty pics 12:54 Examining the boxes 19:14 Outro: complexity of the USB and future work Full Playlist:"
YouTube Link 2021-09-17T06:00Z 238K followers, 183.8K engagements
"Apollo Guidance Computer Part 22: Module B11 fails again Shortly after being fully repaired the AGC suddenly fails on us. It's our famed potted module B11 again. In another schematics deep dive Mike finds the likely failing component. And we catch one of its diodes right when it dies. More module digging in perspective. Some relevant links: Playlist of the restoration series: https://www.youtube.com/playlistlist=PL-_93BVApb59FWrLZfdlisi_x7-Ut_-w7 Block I AGC period documentary: https://youtu.be/ndvmFlg1WmE Inertial navigation system documentary: https://youtu.be/wD97RSpiZe0 Schematics:"
YouTube Link 2019-07-17T05:13Z 238K followers, 71K engagements
"Our Strobotac gets a [----] Flash Delay and a Homebrew Optical Probe In this second installment of our Genrad Strobotac repair we repair its companion Tupe 1531-P2 Time Delay with very yucky capacitors in it and make an optical probe for it. Part [--] of the Strobotac repair: https://youtu.be/6zEnetFmy00 Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't"
YouTube Link 2026-02-04T07:30Z 238K followers, 27.8K engagements
"VCF West XI (2016): vintage computing festival highlights There was much happening at the Vintage Computer Festival (VCF West) held at the Computer History Museum in Mountain View CA on Aug. 6-7 [----]. Many more exhibits and talks that fit in one video or that I could possibly document while I was exhibiting at the same time. So this is just a sliver of it made of my personal favorites. By chance I caught some of the award winners including me VCF Vintage Computer Festival Vintage Computing Computer Restoration Hewlett-Packard CuriousMarc HP-85 HP [--] VCF Vintage Computer Festival Vintage"
YouTube Link 2016-08-08T09:15Z 238K followers, 16.2K engagements
"Genrad Strobotac Repair We repair a tube-based stroboscope from the 1950s the infamous Strobotac Type [----] by General Radio. Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): https://teespring.com/stores/curiousmarcs-store "Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod Our lovely sponsors -"
YouTube Link 2025-12-31T08:50Z 238K followers, 33.2K engagements
"BK Precision 879B LCR Meter Repair (with Sequre HT140 Hot Tweezers) We repair our BK 879B LCR meter that shows error E02 on startup which is a great excuse to try out our latest SMD tool the Sequre HT140 Hot Tweezers. Get the Sequre HT140 Tweezers here: https://bit.ly/49ZT2DF Gran Sander repair article: https://ptarmiganlabs.com/fixing-a-broken-bk-precision-879b-lcr-meter/ Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2025-06-28T06:18Z 238K followers, 30.6K engagements
"Xerox Alto Restoration Part [--] - Xerox Alto Demo We take you through a demo of our restored Xerox Alto. We go through the Neptune file browser the Bravo text editor the Draw and SIL programs network booting ftp telnet Smalltalk some games and new programs we have made for the Alto. This demo was developed to be presented live at VCF West [----]. And I mispelled Ken's last name it's Ken Shirriff"
YouTube Link 2017-08-13T08:44Z 238K followers, 126.5K engagements
"TI Silent [---] Terminal - Texas Instruments slick answer to clunky Teletypes The Silent [---] Terminal was TIs slick answer to traditional mechanical Teletypes. And ours is not only very silent but it appears to be a screamer. Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - Keysight: test instruments: https://www.keysight.com - Samtec: connectors: https://www.samtec.com Support the team on Patreon: https://www.patreon.com/curiousmarc Buy shirts on Teespring: https://teespring.com/stores/curiousmarcs-store Learn more on the companion site: https://www.curiousmarc.com Contact info:"
YouTube Link 2021-11-27T07:09Z 238K followers, 56.9K engagements
"Oscar's new PDP-10 replica (and PDP-8 and PDP-11 too) Oscar Vermeulen is well-known for his highly accurate scale replicas of DEC's popular PDP computers. Here he shows off the newest member of the family the PiDP-10 which gets us to retrace the history of MIT's AI lab and the Incompatible Timesharing System. Get a PiDP-10: https://obsolescence.wixsite.com/obsolescence/pidp-10-get-one Get Steven Levy's Hackers book: https://amzn.to/4bIVz5w PiDP-10: https://obsolescence.wixsite.com/obsolescence/pidp10 PiDP-8: https://obsolescence.wixsite.com/obsolescence/pidp-8 PiDP-11:"
YouTube Link 2024-05-31T17:30Z 238K followers, 59.9K engagements
"HP 182C Oscilloscope Repair - Part 3: the HP 1821A Timebase plugin from [----] puts up a fight We continue the repair of our HP [---] oscilloscope this time attacking the 1821A horizontal plug in. It might be from [----] but you wouldn't know it from its complexity and refinement which promises to give us a run for our money. HP [---] Repair Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb58rsjI0icp8-iY0SWT_n8aA Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links"
YouTube Link 2025-08-09T21:09Z 238K followers, 31.2K engagements
"HP 182C Oscilloscope Repair - Part 2: Alive Again We continue the repair of a HP [---] oscilloscope. We repaired the High Voltage supply in the previous episode but did not get our trace back. Not to worry we bring it back to life in this episode. HP [---] Repair Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb58rsjI0icp8-iY0SWT_n8aA Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com -"
YouTube Link 2025-08-05T14:00Z 238K followers, 27.9K engagements
"Apollo Guidance Computer Part [--] : Bonus Material By popular demand the uncut footage of the sequence when Mike explains the timing problem on episode [--]. Warning: for the hard core AGC fans only. Some relevant links: Playlist of the restoration series: https://www.youtube.com/playlistlist=PL-_93BVApb59FWrLZfdlisi_x7-Ut_-w7 Block I AGC period documentary: https://youtu.be/ndvmFlg1WmE Inertial navigation system documentary: https://youtu.be/wD97RSpiZe0 Schematics: https://www.ibiblio.org/apollo/links.html#AGC_electrical_schematics and: https://archive.org/details/agc_handbook_jp2 Mike's AGC"
YouTube Link 2019-07-02T08:32Z 238K followers, 45.6K engagements
"HP 182C Oscilloscope Repair - Part 1: High Voltage Power Supply "Accident" We begin the restoration of a gorgeous HP [---] oscilloscope which takes a turn for the worse when an ElectroBOOM event destroys the high voltage power supply. Which is fine we just have to un-destroy it. HP [---] Repair Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb58rsjI0icp8-iY0SWT_n8aA Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2025-08-04T09:12Z 238K followers, 41.2K engagements
"HP 59501B Digital to Analog Converter / Power Supply Programmer Repair We repair two Hewlett Packard HP 59501B units and use them to transform a mundane [----] HP power supply into a digitally programmable one. HP 59501A/B manual scan including readable schematics page: https://archive.org/details/hp-59501b-manual Buy your own HP repair fancy pants: https://shop.curiousmarc.com/products/mr-fancy-pants-plaid-pants Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links -"
YouTube Link 2025-04-14T19:24Z 238K followers, 42.1K engagements
"HP 182C (and 180C/D) Oscilloscope Repair - Part 6: HP 1805A and 1825A [---] MHz Plugins We take advantage that our HP 182C oscilloscope frame is calibrated and that the underside is opened to repair the [---] MHz plugins from my other HP 180C frame. Fortunately it's a less involved repair than the previous plugins but still sneaky faults they were. And those switches I hate those switches. HP [---] Repair Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb58rsjI0icp8-iY0SWT_n8aA Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for"
YouTube Link 2026-01-06T07:45Z 238K followers, 28.7K engagements
"B-52 Bomber Astro Tracker - Part 3: Figuring out the optical system We reverse engineer and power up the optical system of the B-52 Astrotracker. It's as clever as it is complicated B-52 Astrotracker Part 1: https://youtu.be/nkvN74wuT8w B-52 Astrotracker Part 2: https://youtu.be/GkEjLqu-JH0 Michel's Channel: https://www.youtube.com/@UC4Kz0sEXSqNkfi7W1PBKyMg Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2025-03-05T08:30Z 238K followers, 60.6K engagements
"HP 8664A 3GHz Synthesized Signal Generator Repair - Part [--] We repair it for good and tear into HP's proprietary golden box in the process. Repair playlist: https://www.youtube.com/playlistlist=PL-_93BVApb590G-B-_pAp528IiPNnD7H3 Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet):"
YouTube Link 2025-06-25T00:53Z 238K followers, 44K engagements
"Apollo Guidance Computer Part 17: main connector DSKY hook up and Ken mines a bitcoin on the AGC We finally hook up Carl's DSKY which Ken immediately uses for mining a bitcoin on the AGC. We are still not sure exactly why. Link to Ken's AGC bitcoin mining article: http://www.righto.com/2019/07/bitcoin-mining-on-apollo-guidance.html Thanks to PCBWay for expediting our PCBs: https://www.pcbway.com Some relevant links: Playlist of the restoration series: https://www.youtube.com/playlistlist=PL-_93BVApb59FWrLZfdlisi_x7-Ut_-w7 Block I AGC period documentary: https://youtu.be/ndvmFlg1WmE Inertial"
YouTube Link 2019-07-10T00:31Z 238K followers, 86.9K engagements
"Third HP 5061A atomic clock repair: we chase [---] parts per trillion We track down a bad component in the C-Field PCB that likely robbed us of [---] parts per trillion (10E-13) of atomic clock stability. Which would make our relativity experiment fail so we better fix it. HP Atomic Clock playlist: https://www.youtube.com/playlistlist=PL-_93BVApb59F6V90OdcqVofqVWceR6Dk Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2025-07-09T07:10Z 238K followers, 51.8K engagements
"MMD-1 Restoration - Part 1: bringing up the cutest Intel [----] microcomputer trainer We restore the first of our E&L MMD-1 Mini Micro Designers a [----] single board microcomputer designed around the Intel [----] chip. MMD-1 playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5_ITRdT7BjqpjQfCqc58O-g Project Documentation: https://www.curiousmarc.com/computing/mmd-1-intel-8080-trainer Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on"
YouTube Link 2025-10-22T01:31Z 238K followers, 44.2K engagements
"Apollo Guidance Computer Part 15: Recovering lost Apollo software at the Computer History Museum In the previous episode we finally got core rope memory working. This should allow us to read some core rope modules at the Computer History Museum which contain the earliest working Block II program ever written for the AGC and for which no known listing copies exist. The PCB used for the rope terminators in this episode are made and sponsored by PCBway (https://www.pcbway.com). For an in-depth look at the (amazing) details about core rope technology read this article from our very own Ken"
YouTube Link 2019-07-08T00:27Z 238K followers, 93.1K engagements
"Refilling or Replacing Vintage HP Plotter Pens If you own a vintage HP plotter you have certainly been faced with the vexing problem of finding new pens without paying a ransom to some ebay seller of dried out pens. Here is how I revive mine by refilling or making adapter holders for entirely new pens. Hewlett-Packard HP Vintage Plotter Pen Pen Refill Plotter pen Holder CuriousMarc Restoration VIntage Computing Hewlett-Packard HP Vintage Plotter Pen Pen Refill Plotter pen Holder CuriousMarc Restoration VIntage Computing"
YouTube Link 2017-02-14T09:02Z 238K followers, 36.1K engagements
"Apollo Comms Part 2: Inside the Traveling Wave Amplifier We take a closer look at the S-Band power amplifier from the Apollo command module and learn how traveling wave tubes brought us voice TV and data back from the Moon. The amplifier was manufactured by Collins who was the prime contractor for the entire Apollo telecommunication system. 00:00 Recap of previous episodes 01:53 Physical location of the amp in the CM 02:35 Identifying the main functional elements 08:02 RF switches and emergency modes 11:14 Actual audio of Apollo [--] using the emergency mode 12:46 Making sense of the coax maze"
YouTube Link 2021-10-07T18:39Z 238K followers, 122K engagements
"Apollo Comms Part 22: How NASA Upgraded the Moon TV to Color Barely a year after the first black and white TV transmission from the Moon NASA upgraded it to color. This is how this was done and we try it on our original Apollo link too. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Stan Lebar interview at the Early Television Museum: https://youtu.be/Hjxi6r6TPr4 Links to doc: https://www.curiousmarc.com/space/apollo-s-band-communications https://virtualagc.github.io/virtualagc/QuestForInfo.html https://www.ibiblio.org/apollo/ Our"
YouTube Link 2022-10-02T08:30Z 238K followers, 65.4K engagements
"B-52 Bomber Astro Tracker - Part 1: Grand Opening (ft. Le Labo de Michel) We open up a B-52 Bomber Astro Tracker to reveal a masterpiece of cold war engineering. Michel's Channel: https://www.youtube.com/@UC4Kz0sEXSqNkfi7W1PBKyMg EEVblog #854: https://youtu.be/hzGaO4Kdz2Y Using an Astrocompass in a Boeing 737: https://youtu.be/P6J5nfflNNY Vintage Air Force Astro Navigation Training Video: https://youtu.be/UV1V9-nnaAs Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab:"
YouTube Link 2024-12-08T08:55Z 238K followers, 185.5K engagements
"Hard to repair Commodore PET A broken 8-bit Commodore PET gives us the hell of a hard time. Ken's blog article on the PET repair: https://www.righto.com/2025/04/commodore-pet-repair.html Retro Chip Tester Pro: https://americanretro.shop/retro-chip-tester-products/ Ghidra decompiler: https://ghidra-sre.org History of the PET on the 8-Bit Guy channel: https://www.youtube.com/watchv=eP9y_7it3ZM Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on"
YouTube Link 2025-04-18T03:30Z 238K followers, 70.1K engagements
"Can your oscilloscope do this (HP 54622A) This sweet HP scope has a hidden feature that I have not seen on any other scope. And now that I have tried it I think it is essential to every engineer. And as you'd expect the user interface is at the same level of quality as the easter egg the firmware guy planted in there. Kudos Mr. HP firmware engineer you made this one of the best scopes ever. Tell us in the comments which scope is your favorite or the worst you have seen Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I"
YouTube Link 2025-03-25T07:10Z 238K followers, 43.6K engagements
"All you never wanted to know about [--] inch floppy drives We connect an 8" floppy drive to a PC learn the [--] ways they are different from standard PC floppies and even design an adapter and make it available for all on Tindie. Chapters: 00:00 Intro 01:20 My 8" drives come from an HP [----] 02:37 The IBM 8" floppy and its media 06:03 Antoine's 8" floppy adapter 07:06 Booting my PC from the 8" floppy 08:24 8" drive restoration and bring up 11:08 Making the prototype cable adapter 20:16 The [--] quirks of 8" floppies 20:52 Single sided vs. double sided 21:48 Write protect works reverse 22:52 Four"
YouTube Link 2023-01-13T07:06Z 238K followers, 92.8K engagements
"Free Abandoned HP 3478A 5- Digit DVM Repair We repair a classic HP 3478A 5- digit voltmeter and admire its ultra complicated A to D converter. HP Multislope II ADC patent: https://patents.google.com/patent/US4357600A/en Ian Scott Johnston video on HP [----] backlight mod: https://youtu.be/oEu7nqOkKxo Blacklight display mod: https://www.eevblog.com/forum/testgear/another-hp3478a-backlight-display-hack/ LCD protocol reverse engineering: https://www.eevblog.com/forum/projects/led-display-for-hp-3457a-multimeter-i-did-it-)/msg1347268/#msg1347268 OLED mod:"
YouTube Link 2024-03-01T02:34Z 238K followers, 69.6K engagements
"Rare LED watch chip from Texas Instruments (HP [-----] Repair-a-thon Part 0) In a previous episode we decapped a Chinese sourced vintage LED watch chip. Surprisingly it looked like a legit one. But it still did not work in my HP circuit. What about checking it by making a retro LED watch out of it Head over to Patreon for the better but demonetized version of this video. Edit: I eventually made a bubble LED hack watch out of it: https://youtu.be/m_juPAK7I_I Music Credits: Ether Disco by Kevin MacLeod Link: https://incompetech.filmmusic.io/song/3719-ether-disco License:"
YouTube Link 2020-09-28T02:18Z 238K followers, 77.6K engagements
"Genuine NASA Apollo DSKY Full Restoration (Apollo DSKY - part 2) We restore a genuine Apollo DSKY to full operation. And then we use it Link to our DSKY talk at VCF West 2024: https://youtu.be/2l5cBzTX5fc AGC info at: https://www.ibiblio.org/apollo/ Software at: https://github.com/virtualagc/virtualagc Documentation at: https://archive.org/details/virtualagcproject Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2025-03-15T09:15Z 238K followers, 118.9K engagements
"HP 8664A 3GHz Synthesized Signal Generator Repair - Part [--] We dive into the intimidating RF guts of an HP 8664A [--] GHz high-performance RF generator. And there is an extra level of difficulty - being from the 1990s HP doesn't even give the schematics for it. That's going to make our life way more difficult. Repair playlist: https://www.youtube.com/playlistlist=PL-_93BVApb590G-B-_pAp528IiPNnD7H3 PLL Frequency Synthesis is explained in this video: https://youtu.be/z-50pSc_wg8 RF Mixers are explained in this video: https://youtu.be/01GzduUaLOE Stuff that supports the channel: - Support us on"
YouTube Link 2025-06-12T05:24Z 238K followers, 52.4K engagements
"HP 182C Oscilloscope Repair - Part 4: HP 1821A timebase really tough debug We continue the repair of the 1821A horizontal plug in which turns into a bit of a nightmare including the release of magic smoke. But we get the better of it. HP [---] Repair Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb58rsjI0icp8-iY0SWT_n8aA Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy"
YouTube Link 2025-08-12T22:35Z 238K followers, 29.2K engagements
"Apollo Comms Part 31: UDL Grand Opening and Power Up We open up the Up Data Link box which was the remote control box for the spaceship and power it up for the first time. Many thanks to Hirox: https://www.hirox-usa.com Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to doc: https://www.curiousmarc.com/space/apollo-s-band-communications https://virtualagc.github.io/virtualagc/QuestForInfo.html https://www.ibiblio.org/apollo/ https://www.ibiblio.org/apollo/Documents/HSI-481260.pdf Elevator Music Credit: Crinoline Dreams by Kevin"
YouTube Link 2024-06-25T22:41Z 211K followers, 37.6K engagements
"HP 115BR Divider and Clock - Part [--] With great difficulty we repair our Patron-donated HP 115BR divider and clock an instrument that was once used to synchronize all of the world's atomic clocks. It requires a bit of a fight but in the end we are rewarded with the most steampunk atomic clock ever Link to the HP 115BR Manual: https://bama.edebris.com/download/hp/115br/HP_115BR_frequency_divider_and_clock_op_service_manual_1967.pdf Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab:"
YouTube Link 2024-11-08T05:06Z 214K followers, 31.9K engagements
"HP 106B Double Ovenized Quartz Oscillator with dubious modifications We repair our HP 106B Quartz oscillator the most stable quartz oscillator in the HP lineup of [----] and still one of the best today. It has an adjustment knob graduated in parts in [----] (10 parts per trillion) which is unusually small. And ours has some really dubious modifications hidden inside Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2024-11-11T00:30Z 214K followers, 27.7K engagements
"Apollo Comms Part 34: Trying every function of the Apollo command system We finally have our Apollo command system all working Let's understand and try every function so we can hack the Apollo spacecraft the next time they launch it. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to doc: https://www.curiousmarc.com/space/apollo-s-band-communications https://virtualagc.github.io/virtualagc/QuestForInfo.html https://www.ibiblio.org/apollo/ https://www.ibiblio.org/apollo/Documents/HSI-481260.pdf Elevator Music Credit: Crinoline"
YouTube Link 2024-10-08T19:30Z 213K followers, 52.5K engagements
"New CZUR ET Max: How I scan Vintage Manuals The new [--] MP CZUR ET Max book scanner is out and CZUR asked me if I could do a video on it. I'll be happy to oblige as this is the brand of scanners that I use to scan my vintage manuals. Edit: CZUR tells me that the finger cots removal function is meant to work in Black & White scan mode not in grayscale mode. Switching to B&W should fix the problem. CZUR ET Max Kickstarter: https://www.kickstarter.com/projects/czur-notebook/czur-et-max-the-unprecedented-professional-book-scanner My scans on archive.org:"
YouTube Link 2025-02-14T09:15Z 229K followers, 23.8K engagements
"Apollo Guidance Computer Part 21: Playing moon landing on our restored AGC The repaired AGC should provide us with 1960's best real life video game ever. Thanks to our improvised PIPA accelerometer we can now trick the AGC into thinking it's flying a LM. We fly through the whole landing sequence: program P63 braking P64 approach and P65 landing. We don't quite fly it in a closed loop as intended and the landing is soft only in one direction but that is the hell of a video game. Some relevant links: Playlist of the restoration series:"
YouTube Link 2019-07-16T05:04Z 238K followers, 97.5K engagements
"Whisper Writer to Radio Teletype Conversion In this revenge-of-the-Teletype episode we reverse engineer our super-modern (1984) 3M Whisper Writer Telex machine and turn it into a fully featured RTTY receiver and Teletype tester. Get your PCBs from our sponsor PCBWay: https://www.pcbway.com Schematics: https://drive.google.com/file/d/1tic2. Full project info (Kicad files ROMs etc.) on my website: https://www.curiousmarc.com/computing. Stuff that supports the channel: - Amazon links for the tools I use in the lab (supports the channel if you buy from there)"
YouTube Link 2023-09-03T20:55Z [---] followers, [----] engagements
"Samsung ML-2525W laser printer double repair: picks up two sheets does not power on In the Modern Tech Fails series we tackle the Samsung ML-2525W laser printer which fails like all its siblings for stupidly simple reasons. Nice video of the solenoid repair (in Russian): https://youtu.be/PM-Lc8DpLFc Previous video where we tear down a failed Capxon capacitor and a good capacitor: https://youtu.be/Z4Kp8BDMzHY Stuff that supports the channel: - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2024-04-04T17:57Z 208K followers, 21.3K engagements
"The IBM [----] Mainframe Computer Wishes you a Merry Christmas Ken Shirriff uses the computing power of our vintage [----] IBM mainframe at the Computer History Museum for holiday mischief. More info on Ken's blog at: http://www.righto.com/2017/12/creating-christmas-card-on-vintage-ibm_7.html"
YouTube Link 2023-11-03T00:51Z 189K followers, 30K engagements
"Apollo Comms Part 20: Pre-Modulation Processor Power Up We power up the Apollo Pre Modulation Processor for the first time. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to doc: https://www.curiousmarc.com/space/apollo-s-band-communications https://virtualagc.github.io/virtualagc/QuestForInfo.html https://www.ibiblio.org/apollo/ Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - ElectroRent: https://www.electrorent.com - Keysight: test instruments: https://www.keysight.com - Samtec: connectors:"
YouTube Link 2022-07-25T18:36Z 233K followers, 43.9K engagements
"Shuttle Teleprinter - Part 1: a [--] lbs TTY in space what gives The Space Shuttle had a teletype onboard for the first [--] years of its tenure. We get our hands on one of them and try to revive it. Ken article on the Space Shuttle Teleprinter: http://www.righto.com/2024/08/space-shuttle-interim-teleprinter.html Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring"
YouTube Link 2024-12-15T00:46Z 217K followers, 50.3K engagements
"Teletype Model [--] Part 12: Reassembling the Transmitter/Distributor I finish restoring the Transmitter/Distributor that came with my Model [--] Teletype system. Mine was a full tear down so it took me much more time than Carl (see his in episode 10) but I finally completed the reassembly successfully. The result was well worth it. Teletype Model [--] Restoration Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5-9eQLTCk9xx16RAGEYHH1q Music Credit: Paragon Rag by Scott Joplin played by Scott Kirby"
YouTube Link 2018-09-30T08:02Z 233K followers, 23.2K engagements
"Apollo Ground Service Equipment Panel Prop It's time to build a home for my Apollo era switches and displays so we make a functional GSE prop in the spirit of the great Apollo ground control panels. Whether we'll use it in our projects or not remains to be seen. Earlier video on these Apollo switches: https://youtu.be/ri_7vfzyamQfeature=shared Avery Asset Tags: https://www.avery.com/custom-printing/labels/calculator/asset-tag-silver Music Credits: Festive Dinner by Pony Music (licensed by Envato) Our sponsor for PCBs: https://www.pcbway.com Support the team on Patreon:"
YouTube Link 2021-01-15T08:04Z 214K followers, 44.6K engagements
"Apollo Guidance Computer Part 19: It finally works We were are able to make the original erasable core memory work under the watchful eye of guests more famous than us. This completes the restoration of the AGC. In the process we dump the historical content that was still present in the memory module and find all kinds of interesting things. Frequent comment answers: Yes we know about Francois Rautenbach and the Block I core ropes (https://youtu.be/WquhaobDqLU). These ropes are also from Jimmie but are not compatible with our Block II computer. Yes we are in contact with Fran"
YouTube Link 2019-07-12T17:53Z 223K followers, 110.7K engagements
"Helping LGR to restore a vintage Sanyo ICC-0082 calculator LGR asked for help rescuing a gorgeous Dictaphone [----] calculator ne Sanyo ICC-0082. We are happy to oblige. And while we are at it Ken reverse engineers the enigmatic Sanyo chipset that makes it tick. LGR's original video: https://youtu.be/Sq_GFKpPhnY Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - Electro-Rent: https://www.electrorent.com - Keysight: test instruments: https://www.keysight.com - Samtec: connectors: https://www.samtec.com Support the team on Patreon: https://www.patreon.com/curiousmarc Buy our merch on"
YouTube Link 2022-10-03T23:19Z 229K followers, 104.9K engagements
"HP 8664A 3GHz Synthesized Signal Generator Repair - Part [--] We wrestle with the Output Amp board reverse engineer it and make some actual progress. Repair playlist: https://www.youtube.com/playlistlist=PL-_93BVApb590G-B-_pAp528IiPNnD7H3 Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet):"
YouTube Link 2025-06-20T00:37Z 238K followers, 40.1K engagements
"HP [----] Terminal - Part 3: Living the ASCII Life This is a multi-part series for HP and terminal lovers focusing on the HP 264x terminal series from 1974-1982. Now that we have loaded fancy fonts it's time to connect it to a computer. And live the [----] life in full black and white ASCII. Documents font maps and ROM dumps at https://www.curiousmarc.com/computing/hp-264x-terminals 00:00 Recap of previous episodes 00:44 Figuring out the communication card settings 04:04 Figuring out the cable with the Palladin cable tester 05:50 Testing with the test plug 06:52 Communication established 08:04"
YouTube Link 2018-02-06T07:19Z 231K followers, 37.8K engagements
"IBM PS/2 - Part 1: the Model [--] conks out We take a look at an IBM PS/2 Model [--]. The high end machine ran a [---] DX2 at [--] MHz with up to [--] MB of memory a SCSI interface and had one of the first and best accelerated graphics card supporting XGA resolution. Beautiful hardware But inside everything is nicely proprietary and incompatible courtesy of IBM marketeers which were obviously up to no good. Which is going to make our life difficult if it dies. Which it does. PS/2 repair playlist: https://youtube.com/playlistlist=PL-_93BVApb58kWwk4MTZAeIWmvNjf1QGB Our sponsor for PCBs:"
YouTube Link 2021-08-13T23:40Z 226K followers, 34.1K engagements
"B-52 Bomber Astro Tracker - Part 2: Power up and gyro-stabilization We reverse engineer this insanely complicated masterpiece of cold war engineering and manage to gyro-stabilize it. B-52 Astrotracker Part 1: https://youtu.be/nkvN74wuT8w Previous video on synchros: https://youtu.be/8QvoY4_xBjw Ken's article on servomotor generators: https://www.righto.com/2024/02/bendix-cadc-servomotor-tachometer.html Michel's Channel: https://www.youtube.com/@UC4Kz0sEXSqNkfi7W1PBKyMg EEVblog #854: https://youtu.be/hzGaO4Kdz2Y Stuff that supports the channel: - Support us on Patreon:"
YouTube Link 2025-01-07T05:48Z 231K followers, 71.1K engagements
"Apollo Comms Part 33: Is there something wrong with our NASA Up Data Link transmitter In the last episode we managed to send Up Data commands using a PSK transmitter made up of HP equipment. But we were unsuccessful when using our original NASA UDL transmitter. Is there still something wrong with it Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to doc: https://www.curiousmarc.com/space/apollo-s-band-communications https://virtualagc.github.io/virtualagc/QuestForInfo.html https://www.ibiblio.org/apollo/"
YouTube Link 2024-07-26T18:30Z 225K followers, 46.8K engagements
"Apollo DSKY - part 1: we have a real (and broken) DSKY Thanks to Marcel we have a real DSKY in the lab. It has a few issues though. Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): https://teespring.com/stores/curiousmarcs-store "Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod Our lovely"
YouTube Link 2025-01-13T07:30Z 221K followers, 144.4K engagements
"HDSP-2112 vintage LED "intelligent" displays We take a break from complicated stuff to relax and admire a Hewlett-Packard HDSP-2112 LED display from [----] using an HP internal demo box that propped up at a Silicon Valley flea market. Amazingly these displays are still made today Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have everything"
YouTube Link 2025-07-13T01:25Z 238K followers, 44.8K engagements
"Space Shuttle Teleprinter - Part 3: It Prints The Space Shuttle had a teletype onboard for the first [--] years of its tenure. We get our hands on one of them and try to revive it. Ken's article on the Space Shuttle Teleprinter: http://www.righto.com/2024/08/space-shuttle-interim-teleprinter.html Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have"
YouTube Link 2025-02-05T16:12Z 223K followers, 37K engagements
"HP 3438A DVM Repair Update: Ohms range saved by commenters It wasnt the hybrid In this update we repair the HP 3438A ohms range thanks to the helpful comments from our viewer community. My HP 3438A Service Manual Scan: https://archive.org/details/hp-3438-a-digital-multimeter-operating-and-service-manual/mode/2up HP 3478A Multislope II DVM repair: https://youtu.be/p1r5ze8Xcfw "Hey Birt" Channel: https://www.youtube.com/@HeyBirt Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab:"
YouTube Link 2025-01-09T04:45Z 233K followers, 34.1K engagements
"Diode Sampler Magic The HP plugin we just repaired has a magic RF circuit in it: a diode sampler that goes up to [--] GHz. It is well worth playing a little more with it and understanding how this extraordinary circuit which is still relevant today actually works. Previous video about the HP 5257A [--] GHz transfer oscillator plugin: https://youtu.be/sl_Zh-IxVTA Further documentation on my website: https://www.curiousmarc.com/instruments/hp-5245l-nixie-counter#h.ixw2jz3t1jtb Stuff that supports the channel: - Amazon links for the tools I use in the lab (supports the channel if you buy from there)"
YouTube Link 2023-09-29T07:27Z 214K followers, 42.1K engagements
"HP 115BR Hackaday [--] Hertz Challenge entry Not a regular video This is a redux of the HP 115BR restoration saga for my entry in the Hackaday [--] Hertz Challenge contest: https://hackaday.io/contest/203248-one-hertz-challenge Project page: https://hackaday.io/project/203540-hp-115br-the-clock-that-once-synced-the-world But of course I have no merit The HP engineers take all the credit. I still would love them to win ;-). Original HP 115BR restoration videos series: https://www.youtube.com/playlistlist=PL-_93BVApb5-_7sWRxQ0on8vNy7_H-zxS Stuff that supports the channel: - Support us on Patreon:"
YouTube Link 2025-07-17T07:58Z 238K followers, 27.4K engagements
"The IBM [----] mainframe runs "Edith" This politically incorrect one is going to lose me the precious few female followers left on my channel. But for the good of academic research we were asked to run the program "Edith" on the vintage [----] IBM mainframe at the computer history museum. Which goes on to prove that the more technology evolves the more things stay the same. And I forgot how to pronounce the alphabet in German. Original code and IBM [----] emulator to run it can be found on my website: https://www.curiousmarc.com/computing/ibm-1401-mainframe/ibm-1401-edith Our sponsor for PCBs:"
YouTube Link 2018-06-02T20:18Z 229K followers, 225.7K engagements
"HP 182C Oscilloscope Repair - Part 5: HP 1801A Dual Vertical Amplifier Plugin We continue the repair of the 1801A vertical [--] MHz plug in which we had started live during the Opensauce show. We found it had a fault in the proprietary and very mysterious delay line and weren't sure if we could even repair it. We are going to try our best in this episode. HP [---] Repair Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb58rsjI0icp8-iY0SWT_n8aA Cascode amplifier videos: https://www.youtube.com/watchv=j3r0-3vYkO4 https://www.youtube.com/watchv=iiUS-3kinqU Stuff that supports the channel: -"
YouTube Link 2025-08-28T20:09Z 238K followers, 34.6K engagements
"1962 Japanese 9-Transistor Radio In this mini video we fix up and admire an early Japanese 9-transistor AM-FM radio which must have felt like a wonder of miniaturization at the time. It was OEM'ed under dozens of different brand names around the world. Many thanks to Jeri Ellsworth for donating this unit. Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I"
YouTube Link 2024-07-11T17:32Z 214K followers, 28K engagements
"Modern Tech Fail: iMac 27" Retina 5k Display Panel Tear Down This is a follow up to my previous iMac repair video (https://youtu.be/yKD682dBbSQ) in which the display developed a blank column during reassembly. We find the root cause admire the fantastic LED back illumination optical engineering take a look under the microscope and even repurpose it into a high uniformity photographic lamp"
YouTube Link 2018-11-29T01:49Z 225K followers, 69.1K engagements
"May the 4th Vintage Hack #retro #computer #starwars #maythe4thbewithyou Oh no I'm one day late Hopefully it still counts. Original full length video from [----] here: https://youtu.be/UNdu0YQfvF0"
YouTube Link 2024-05-06T03:38Z 226K followers, 11K engagements
"Apollo Guidance Computer Part 10: Mike flies Apollo 11s P63 lunar landing on his AGC replica Mike Stewart flies Apollo [--] P63 lunar landing using his new AGC monitor and his gate-exact AGC replicas. This episode is made possible by our sponsor PCBWay (https://www.pcbway.com/anniversary5sales.html right now celebrating their 5th Anniversary [----] sets gifts+ free coupons giveway+ lucky draw). The AGC monitor replica a key piece of AGC ground test equipment used by MIT for debugging the AGC has been built in preparation for our upcoming next encounter with the real AGC. Mike's FPGA AGC code and"
YouTube Link 2019-06-03T08:49Z 215K followers, 100.5K engagements
"Our first dual atomic clock comparison experiment does not go as planned We attempt to measure two atomic clocks' drift with the help of a pile of HP measurement equipment and find ourselves in trouble. Atomic clock playlist: https://youtube.com/playlistlist=PL-_93BVApb59F6V90OdcqVofqVWceR6Dk&si=a-6_MEF04EM6DMkp Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on"
YouTube Link 2025-04-25T05:18Z 238K followers, 91.3K engagements
"We restore the HP [----] dual 8" diskette to play a Colossal Cave game (ft. Usagi Electric) We restore a vintage HP 9895A dual 8" diskette HP-IB drive and put it to good use by playing the Colossal Cave Adventure on the HP [----] calculator. Part [--] repairing difficult HP 9895's: https://youtu.be/u8LVfJcakMQ 8" Floppy Playlist: https://youtube.com/playlistlist=PL-_93BVApb59tOBmcSGTdc79zuEgp6MxF&si=FWBA4AhHjoQ964gh HP [----] Playlist: https://youtube.com/playlistlist=PL-_93BVApb58Hy846J52DT8FeF9USYJUn&si=ubr1GO7EtGn5h8Iy Stuff that supports the channel: - Amazon links for the tools I use in the lab:"
YouTube Link 2024-04-02T01:25Z 226K followers, 55.8K engagements
"Space Shuttle Barber Pole Annunciators I bought some barber pole annunciators that were used in the Shuttle control panels and are similar to the ones use on Apollo also. I have always been curious to see how they work and look in person. Now we'll finally know Shuttle control panel drawings: https://www.ibiblio.org/apollo/Shuttle/VL70-730102_Orbiter_OV-102_Display_and_Control_Panel_Configuration.pdf Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel"
YouTube Link 2025-04-02T07:15Z 238K followers, 50.6K engagements
"Apollo Guidance Computer Part 8: a Blinkenlight AGC (and help from Samtec on the way) In this update Mike reveals the hidden Blinkenlights of the AGC. This episode is made possible by our sponsors Samtec (https://www.samtec.com) and PCBWay (https://www.pcbway.com). Some answers to frequent comments and relevant links: Yes we know about Francois Rautenbach and the Block I core ropes (https://youtu.be/WquhaobDqLU). These ropes are also from Jimmie and not compatible with our Block II computer Yes we are in contact with Fran https://youtu.be/UjcfepTdvZI (and several others) about their superb"
YouTube Link 2019-04-05T18:36Z 226K followers, 100.4K engagements
"Tektronix PS2521G triple power supply repair and upgrade My great Tektronix PS2521G is suddenly blowing many of its fuses. We take advantage of the repair to upgrade a few things too. Update: viewer Jim Flanagan provided the ultimate solution for the "on" LED replacement: don't replace it. Instead make it blink He reversed engineered the firmware then modified it to make the LED blink when the power supply is on. You'll need to burn a new 32k EPROM to replace the original one. Works wonders I have now done the upgrade on both of my power supplies. Details on my website:"
YouTube Link 2022-12-03T21:15Z 225K followers, 44.1K engagements
"HP 182C Scope Live Repair at Opensauce [----] Just a quickie video so you can get the vibe of our exhibition at Opensauce [----] this weekend. "Shot on iPhone" video and sound quality may vary. HP [---] Repair Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb58rsjI0icp8-iY0SWT_n8aA Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have everything"
YouTube Link 2025-07-20T18:12Z 238K followers, 27.3K engagements
"Ted Kennedys [----] Massachusetts driver license replica made on my IBM keypunch for a movie I was contacted by a movie production to make some props for an upcoming movie about the Chappaquiddick incident namely a reproduction of Ted Kennedys driving license. Like the original I will make it on my restored 1960s IBM punched card machine and my IBM Selectric typewriter. This is in [----] when Ted Kennedy drove off a bridge tragically resulting in the drowning of a young female campaign staffer and ensuing scandal. They needed replicas of 1960's Massachusetts driving licenses and applications"
YouTube Link 2016-11-10T05:09Z 215K followers, [----] engagements
"IBM Vintage Mainframe Peripherals Hauling Expedition I just bought a vintage [----] lines per minute IBM mainframe line printer on fleabay It weighs in at [---] lbs so it's local pickup only. Time to take a truck visit the place and see what other treasures we can find"
YouTube Link 2017-10-16T07:13Z 226K followers, 23.3K engagements
"Modern Fails: Newall C80 DRO repair My expensive lathe digital readout just failed and Newall does not want to repair it So we reverse engineer it and find out that the proprietary principle of operation is absolutely genius involving ball bearings and magnetics with a readout precision of better than [--] microns. And the fault is quite unexpected. Hint: not a capacitor. Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2024-08-20T08:38Z 212K followers, 29K engagements
"IBM System/360 Front Panel I recently acquired this front panel from an IBM [---] mod [--] with lots of switches and over [---] blinkenlights. The IBM System/360 was an iconic mainframe computer introduced in [----] (see promotional video here: https://youtu.be/V4kyTg9Cw8g). The system was a huge development gamble for IBM with all the "models" from small to huge sharing mostly the same overall architecture and instruction set but with radically different hardware implementations depending on the cost and performance point. A key novelty was the introduction of "SLT" ceramic hybrid modules pre-dating"
YouTube Link 2017-02-01T09:38Z 225K followers, 148.5K engagements
"Teletype ASR [--] Part 4: Returning the print section to life We are restoring an 8-bit ASR [--] teletype introduced in [----]. In the last episode we got the send section to work again and receive/print section just to wiggle a bit. In this episode we try to return the receive / printer section to fuller life. ASR [--] Restoration Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5-84G5kmgfuu7TQduTMc73H"
YouTube Link 2019-10-13T07:06Z 226K followers, 18.4K engagements
"The IBM [---] keypunch mechanical keyboard: insanely complicated I am repairing the mother of all mechanical keyboards: the IBM [---] keypunch keyboard. And when I say mechanical I really mean it See a quick demo of my restored IBM [---] punch: https://youtu.be/YnnGbcM-H8c Ken's blog article on how it works: http://www.righto.com/2017/12/repairing-1960s-era-ibm-keypunch.html Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - Electro-Rent: https://www.electrorent.com - Keysight: test instruments: https://www.keysight.com - Samtec: connectors: https://www.samtec.com - R&D Microwaves:"
YouTube Link 2022-11-19T00:01Z 214K followers, 57.7K engagements
"TV-2B/U Military Tube Tester Restoration - Part [--] We attempt to revive a TV-2BU military electron tube tester which is mighty good but mighty complicated. Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): https://teespring.com/stores/curiousmarcs-store "Elevator Music" Credit: Crinoline Dreams by Kevin"
YouTube Link 2025-08-01T09:30Z 238K followers, 33.5K engagements
"Curiousmarc at OpenSauce [----] Announcement #opensauce Opensauce live: https://opensauce.com Get more technical info on the companion site: https://www.curiousmarc.com Contact info: https://www.youtube.com/curiousmarc/about CuriousMarc Vintage Tech Retro Computing Restoration Electronic Repairs CuriousMarc Vintage Tech Retro Computing Restoration Electronic Repairs"
YouTube Link 2025-07-15T05:20Z 238K followers, 17.5K engagements
"Another HP 5061A atomic clock comes in for repair and it's very broken We repair another HP 5061A atomic clock that keeps failing on us. But wait until you see the result after we get it working again. Atomic clock playlist: https://youtube.com/playlistlist=PL-_93BVApb59F6V90OdcqVofqVWceR6Dk Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have"
YouTube Link 2025-05-14T05:51Z 238K followers, 60.7K engagements
"Open Circuits: Eric cuts through electronic components and reveals their hidden inner beauty Eric (@TubeTimeUS) went on a rampage slicing through electronic components teamed up with Windell (Evil Mad Scientist @EMSL) and published a new book. In this video we show how they made the incredible pictures in the book. Buy book or electronic version directly from the publisher: https://nostarch.com/open-circuits Or just get it on Amazon: https://www.amazon.com/Open-Circuits-Beauty-Electronic-Components/dp/1718502346 Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - Electro-Rent:"
YouTube Link 2022-10-11T05:25Z 223K followers, 123.8K engagements
"Our booth at Opensauce [----] #opensauce #retro #electronics"
YouTube Link 2025-07-19T01:01Z 238K followers, 35.7K engagements
"TV-2B/U Military Tube Tester Restoration - Part [--] We find more faults in our TV-2BU military electron tube tester which leads to wild chases inside the spaghetti schematics and wiring. Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): https://teespring.com/stores/curiousmarcs-store "Elevator Music""
YouTube Link 2025-08-02T14:18Z 238K followers, 30.5K engagements
"HP 3438A Digital Multimeter Repair Calibration and Principle of Operation Birt from the "Hey Birt" channel donated an HP 3438A digital multimeter. Let's repair it and figure out how its dual ramp A to D converter works. My HP 3438A Service Manual Scan: https://archive.org/details/hp-3438-a-digital-multimeter-operating-and-service-manual/mode/2up HP 3478A Multislope II DVM repair: https://youtu.be/p1r5ze8Xcfw "Hey Birt" Channel: https://www.youtube.com/@HeyBirt Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in"
YouTube Link 2024-12-29T20:42Z 217K followers, 29.2K engagements
"HP and Overland 9-Track Tape Drives Demo Three out of four of my vintage 9-track tape drives are working of tonight including for the very first time my venerable HP 7970E. Time for a video Each of them is special. The jewel of the collection is the HP 7970E a tape drive introduced in [----]. I believe this E model is from [----] or thereabouts. It is serious hardware and weighs in at [---] lbs. I needed to resurrect it for my HP 21MX system of the same period. It talks only to HP equipment using HP-IB so it is quite a challenge to bring online. The other tapes were acquired mostly to support this"
YouTube Link 2015-10-14T06:03Z 215K followers, 69.5K engagements
"Is my vintage equipment trying to send me a message My vintage instruments are behaving oddly. Maybe that's because we made it past [------] subs in the last week of [----] Thanks to all that pressed the little subscribe button and support the channel Someone rightfully commented that videos about the equipment shown would be a good way to explore the channel so here is a list of the related videos: 0:00 HP 9825T Calculator https://youtu.be/whTIFAJ5BZ0 0:22 HP 2645A Terminal https://youtu.be/QikO0WOAGWI 0:31 HP 1607A Logic Analyzer https://youtu.be/SiBozvGl5_I 0:44 Soyuz TM Space Clock power up"
YouTube Link 2021-01-04T05:35Z 232K followers, 118K engagements
"My first computer: the [----] SC/MP 8-Bit Microprocessor Kit Although the SC/MP is very special to me it must have been one of the most under-powered 8-bit microprocessors unleashed at the time (1976). But I didn't know any better and in my 14-year old eyes it was nothing short of amazing. This was my first computer hands-on experience. I discovered microprocessor fundamentals and assembly programming with it all in the glory of raw hexadecimal machine coding. I found my beloved kit again during a visit at my parents along with my notes and brought it back to its native Silicon Valley"
YouTube Link 2017-09-11T05:06Z 231K followers, 116.3K engagements
"Apollo Guidance Computer Part 5: We run a chunk of original Apollo code We are out of time for our first visit and memory is not working. But our whiz kid Mike manages to whip up an FPGA memory emulator for the AGC just before we have to leave. The AGC gets to run a chunk of an original Apollo program Frequent comment answers: Yes we know about Francois Rautenbach and the Block I core ropes (https://youtu.be/WquhaobDqLU). These ropes are also from Jimmie but are not compatible with our Block II computer. Yes we are in contact with Fran https://youtu.be/UjcfepTdvZI (and several others) about"
YouTube Link 2018-12-23T05:10Z 224K followers, 184.1K engagements
"Polaroid magic with monster HP 197A and 198A Oscilloscope Cameras We do Polaroid photography with two HP scope camera monsters dating back to [----] and figure a way to stuff Instax Wide film in a Polaroid pack back. The Polaroid process is nothing short of miraculous. Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have everything transferred to"
YouTube Link 2025-06-01T06:30Z 238K followers, 40.9K engagements
"Apollo Guidance Computer Part 12: Return of the AGC The AGC is in my lab for a short while. We will rush to complete the restoration in time for the 50th anniversary celebration. Step one: finish the testing of the Tray B modules. Bad surprises await. For PCBs use our sponsor PCBWay: https://www.pcbway.com Buy the CuriousMarc DSKY and other retro-computing T-shirts to support the channel here: https://teespring.com/searchq=curiousmarc More information about what's shown in the videos on my web-site: https://www.curiousmarc.com/computing/apollo-guidance-computer Some relevant links: Playlist"
YouTube Link 2019-06-21T04:22Z 238K followers, 74.1K engagements
"F8 Fly-By-Wire System (Apollo Guidance Computer Part 31) We get a chance to inspect the actual Apollo Guidance System that flew in NASA's F8 Digital Fly-By-Wire experimental plane. We explain how it worked and recover the software from its core rope memory. The result is a bit of a surprise Apollo Guidance Computer Restoration Series: https://youtube.com/playlistlist=PL-_93BVApb59FWrLZfdlisi_x7-Ut_-w7 More videos showing some of Steve Jurvetsons collection: Steves collection part 1: https://youtu.be/3Y-MosGsFMs Steves collection part 2: https://youtu.be/5ZBRw07Ibgo Steves collection part 3:"
YouTube Link 2024-02-19T07:26Z 207K followers, 92K engagements
"HP 5061A Atomic Clock Repair Just as we were going to do some exciting relativistic atomic clock experiments one of the clocks went down. Oh well the bright side is that we get to look in the innards of this very complicated instrument. How an atomic clock works: https://youtu.be/eOti3kKWX-c Atomic clock Zeeman alignment: https://youtu.be/xTy1kY_wtsY Hi-res scan of the HP 5061A manual: https://archive.org/details/hp-5061-a-cesium-beam-frequency-standard-operation-and-service-manual-05061-9052-june-1978 Stuff that supports the channel: - Support us on Patreon:"
YouTube Link 2025-01-21T23:30Z 222K followers, 73.1K engagements
"Modern Tech Fail: NAD C 356BEE Amplifier Repair We repair a NAD audio amp where a few components went crispy use the power of zip ties and make a laser show. And yes the thermal design was a bit wanting but NAD does get a brownie point for including the schematics in their service manual. If you want to do a similar repair the components are listed here: https://www.curiousmarc.com/modern-fails/nad-c356-amp-repair Our sponsor for PCBs: https://www.pcbway.com Support the team on Patreon: https://www.patreon.com/curiousmarc Buy shirts on Teespring:"
YouTube Link 2023-10-22T09:16Z 188K followers, 154.1K engagements
"ARU-11/A Attitude Indicator - Part 2: Repair and Demo Our ARU-11/A "8-Ball" attitude indicator is broken and missing its electronics. But that won't stop us from making it work. Many thanks to Patron R.J. Gritter for lending us his instruments. Master Ken's in-depth article about his reverse engineering of the ARU-11/A: https://www.righto.com/2024/09/f4-attitude-indicator.html Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2025-03-26T19:30Z 238K followers, 44.9K engagements
"Apollo LM Caution Lamp A viewer recently donated an unusual item to the channel. It looks like a large gray push button. It turns out it's not a button at all However it has an Apollo part number and of course Mike did track it down. It's a genuine caution lamp from the LM control panel So we go full @Franlab and light it up. Stuff that supports the channel: - Amazon links for the tools I use in the lab (supports the channel if you buy from there) https://www.curiousmarc.com/amazon-links - Channel merch on Teespring: https://teespring.com/stores/curiousmarcs-store - Support us on Patreon:"
YouTube Link 2023-02-06T23:39Z 225K followers, 74.8K engagements
"More live action from Opensauce: atomic clock and a Nixie counter turn on More live action from Opensauce: we turn on an atomic clock donated to the channel by Patreon Wayne Holder and a cute mini Nixie counter for the first time. Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet):"
YouTube Link 2025-07-27T04:39Z 238K followers, 19.5K engagements
"8" Floppy drive final repair and realignment procedure (ft. Usagi Electric) Get your 3D printed parts from PCBWay: https://www.pcbway.com/rapid-prototyping/manufacture/ Usagi Electric (Electric Bunny in Japanese) is visiting us. And I have the very floppy drive his Centurion minicomputer is missing. In this episode we repair the head actuator brake with a professionally printed 3D part and demonstrate how to realign the drive with a professional alignment diskette as well as without it. There will be professional bunnies at the end promised. See Usagi Electric install this very floppy drive"
YouTube Link 2023-10-10T06:03Z 214K followers, 50.2K engagements
"HP 8664A 3GHz Synthesized Signal Generator Repair - Part [--] Oh no We break it even more than it already was. But look at the positive side: in the process of crawling back out of our self created hole we discover a lot more of its inner workings. Repair playlist: https://www.youtube.com/playlistlist=PL-_93BVApb590G-B-_pAp528IiPNnD7H3 Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy"
YouTube Link 2025-06-17T09:30Z 238K followers, 42.1K engagements
"HP 115BR Divider and Clock - Part [--] A generous Patron donated this incredible analog-electro-opto-mechanical clock that was once used to synchronize the world to a microsecond. Let's find out what makes it tick literally. Link to the HP 115BR Manual: https://bama.edebris.com/download/hp/115br/HP_115BR_frequency_divider_and_clock_op_service_manual_1967.pdf Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2024-11-05T08:45Z 214K followers, 31.2K engagements
"HP 3300A Vintage Function Generator Repair The HP 3300A I featured in the previous video needed a little TLC. Here is the video of the repair and adjustment of this great analog function generator. Companion video on the HP [----] series oscillators: https://youtu.be/UeXE39riKFc Companion video of the HP 3310A calibration: https://youtu.be/qpqONAFvxPI Chapters: 00:00 Problems with my HP 3300A 01:42 Principle of operation and schematics overview 03:41 Overview of the inside of the instrument 07:50 Power supply adjustments 09:08 We hit a snag 10:42 Chasing the fault 15:42 Found the bad component"
YouTube Link 2022-02-07T00:08Z 231K followers, 53.5K engagements
"ARU-11/A Attitude Indicator - Part 1: Tear Down and Release of Magic Smoke The ARU-11/A is the next best thing to the Apollo "8-Ball" attitude indicator. We tear one down to understand it then hook it up and it promptly releases the magic smoke. Master Ken's in-depth article about his reverse engineering of the ARU-11/A: https://www.righto.com/2024/09/f4-attitude-indicator.html Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2025-02-02T03:43Z 223K followers, 60.3K engagements
"HP 5087A Distribution Amplifier has a mystery board In preparation for some upcoming atomic clock metrology we repair two HP 5087A distribution amplifiers an instrument so good it was in the catalog from [----] to at least [----]. As luck would have it one of them holds a surprise card that's not documented anywhere. We reverse engineer it and find that it is quite useful. SCSkits [--] to [--] MHz doubler card (HP 05087-60011 replacement): https://www.ebay.com/itm/155570308255 Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I"
YouTube Link 2025-03-10T22:37Z 238K followers, 65.1K engagements
"HP 9895A Part 2: Epic Controller Board Repair (and a transparent chip surprise) We restore more HP 9895A dual 8" diskette HP-IB drives but these will be way more challenging. We'll need a full on logic analyzer assisted repair to debug a really really nasty fault. It's a long video but don't miss the intermission where Master Ken inspects a transparent silicon-on-sapphire chip Many thanks to HP enthusiast Craig Ruff for the ROM dump and disassembly. 8" Floppy Playlist: https://youtube.com/playlistlist=PL-_93BVApb59tOBmcSGTdc79zuEgp6MxF&si=FWBA4AhHjoQ964gh HP [----] Playlist:"
YouTube Link 2024-05-03T08:45Z 214K followers, 49.8K engagements
"Cape Canaveral Historic Launch Sites Visit Thanks to Carl and the Cape Canaveral Space Force Museum we get a very special visit of the cape's historic launch sites and relive the pioneering days of the Space Race. The launch of Explorer [--] (NASA documentary): https://www.youtube.com/watchv=NfMIrKkzRx8 Biography of a Missile (CBS documentary on Explorer 7X ending with Juno II failure): https://www.youtube.com/watchv=o8T8UPtw9l0&t=3155s First Atlas launch: https://www.youtube.com/watchv=q_ksxx_qXNc NASA [----] Gemini Documentary "All Systems Go": https://www.youtube.com/watchv=9AokEeaSGwY Stuff"
YouTube Link 2024-09-01T06:03Z 213K followers, 46.5K engagements
"Apollo Guidance Computer Part 3: Main Bus B Undervolt In preparation for the AGC power up we test the alarm module B8 simulate the Apollo [--] main bus undervolt and discover that our memory is faulty. And we find out how much our AGC did originally cost. Frequent comment answers: Yes we know about Francois Rautenbach and the Block I core ropes (https://youtu.be/WquhaobDqLU). These ropes are also from Jimmie and not compatible with our Block II computer Yes we are in contact with Fran https://youtu.be/UjcfepTdvZI (and several others) about their superb DSKYs replicas. Some relevant links:"
YouTube Link 2018-11-27T04:43Z 215K followers, 160.6K engagements
"Tektronix [---] Curve Tracer Repair and Demo The Tektronix [---] is a superb vintage curve tracer. But mine doesn't work yet from what I think is a fairly common problem. Let's fix it and do a demo. Vintage curve tracers are a load of fun for exploring basic electronics and very useful for vintage work. The Tek [---] and its predecessor the [---] are for good reason much thought after curve tracer classics"
YouTube Link 2016-08-29T07:17Z 225K followers, 29.5K engagements
"HP 410C Vacuum Tube Voltmeter Part 2: AC Probe We jury-rig a tube based AC probe for our HP 410C VTVM. Will it do better than our modern Keysight multimeter (Answer: yes) Atkelar's Second HP 410C Restoration: https://youtu.be/VlpNK7vdQKA Stuff that supports the channel: - Amazon links for the tools I use in the lab (supports the channel if you buy from there) https://www.curiousmarc.com/amazon-links - Channel merch on Teespring: https://teespring.com/stores/curiousmarcs-store - Support us on Patreon: https://www.patreon.com/curiousmarc "Elevator Music" Credit: Crinoline Dreams by Kevin"
YouTube Link 2024-01-09T23:13Z 214K followers, 36.9K engagements
"Teletype ASR [--] Part 8: Paper Tape Punch With the receive/print section now working we turn our attention to the paper tape functions starting with the punch. ASR [--] Restoration Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5-84G5kmgfuu7TQduTMc73H Our sponsor for PCBs: https://www.pcbway.com Support the team on Patreon: https://www.patreon.com/curiousmarc Buy shirts on Teespring: https://teespring.com/stores/curiousmarcs-store Learn more on companion site: https://www.curiousmarc.com Contact info: https://www.youtube.com/curiousmarc/about"
YouTube Link 2020-02-03T06:48Z 233K followers, 24.4K engagements
"Antoine's Home Lab A different and lighter video for once in the form of a visit and shout-out to Antoine our multi-talented retro-electronician paleontologist and musician friend all roll-up into one. Find him on: - Twitter: https://twitter.com/Siliconinsid - eBay: https://www.ebay.com/sch/aberco/m.html Your purchases will help paleontology. Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - Electro-Rent: https://www.electrorent.com - Keysight: test instruments: https://www.keysight.com - Samtec: connectors: https://www.samtec.com Support the team on Patreon:"
YouTube Link 2022-02-25T17:59Z 230K followers, 23.7K engagements
"Space Shuttle Teleprinter - Part 2: So many mechanical issues The Space Shuttle had a teletype onboard for the first [--] years of its tenure. We get our hands on one of them and try to revive it. In this episode we attempt to fix the many mechanical issues. Ken article on the Space Shuttle Teleprinter: http://www.righto.com/2024/08/space-shuttle-interim-teleprinter.html Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2024-12-31T20:25Z 217K followers, 34.7K engagements
"Apollo [--] Source Code: Looking at the original flown code printout and the [----] error fix Mike Stewart recently acquired an original source code listing of Apollo [--] that he had been working on for years. In this longish video he gives us a glimpse of what's inside including the software fix for the infamous [----] errors that had plagued the Apollo [--] landing. 0:00 How we got the Apollo listings 2:45 How to read the assembly listings 16:50 Landing on the Moon with the P66 program 18:15 [----] error fix code added after Apollo [--] 24:27 Version control in the 1960's The scan of the listing has"
YouTube Link 2020-05-10T07:35Z 234K followers, 579.2K engagements
"Apollo Comms Part 24: Interface Simulator bring up We bring up one more NASA test equipment box that takes care of all the subcarriers. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to doc: https://www.curiousmarc.com/space/apollo-s-band-communications https://virtualagc.github.io/virtualagc/QuestForInfo.html https://www.ibiblio.org/apollo/ Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - ElectroRent: https://www.electrorent.com - Keysight: test instruments: https://www.keysight.com - Samtec: connectors:"
YouTube Link 2022-12-09T07:53Z 234K followers, 54.8K engagements
"2025 CuriousMarc Channel Rewind Just a quick retrospective on what we achieved in [----]. Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): https://teespring.com/stores/curiousmarcs-store "Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod Our lovely sponsors - PCBWay: fast turn PCBs"
YouTube Link 2026-01-16T09:44Z 238K followers, 19.3K engagements
"Dolch Pac [--] - Part 6: Adding Soundblaster SCSI GPIB and USB cards to a Win98 computer Our Dolch PAC [--] is repaired and running Win98 We add a Soundblaster Live Card a PCI USB2 card an old Adaptec SCSI and ISA National Instruments GPIB card to make it a capable retro-tool. Quite a bit of work to make all that function correctly under Win98 and DOS as you will see in the video"
YouTube Link 2018-07-03T04:22Z 234K followers, 13K engagements
"Using a [----] Teletype as a Linux Terminal Commenters requested that we use our restored vintage [----] Model [--] Teletype as a terminal for Linux. Hooking up a 5-bit mechanical contraption that predates computers by eons to a modern OS even one that is terminal friendly is not without some challenges. But hey they are both clever lovely and digital Should work right It had to be tried. edit And now you can hear the bell(s) Actually a whole episode on it: https://youtu.be/b2QPy-igBLA Teletype Model [--] Restoration Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5-9eQLTCk9xx16RAGEYHH1q My"
YouTube Link 2020-04-13T23:35Z 234K followers, 1.7M engagements
"Visiting the System Source Computer Museum We get a private tour of the System Source Museum near Baltimore MD. What a gem of a computer museum Stuff that supports the channel: - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): https://teespring.com/stores/curiousmarcs-store - Support us on Patreon: https://www.patreon.com/curiousmarc "Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod"
YouTube Link 2024-04-30T01:04Z 234K followers, 34.3K engagements
"Apollo Comms Part 26: Full system integration Morse TV and upvoice are up and an exhibit We hook it up all together and exhibit at DesignCon [----]. Many thanks to Samtec for their support: https://www.samtec.com . Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to doc: https://www.curiousmarc.com/space/apollo-s-band-communications https://virtualagc.github.io/virtualagc/QuestForInfo.html https://www.ibiblio.org/apollo/ Music Credit: Swipesy Cake Walk by Scott Joplin played by Scott Kirby https://scottkirby.net Our sponsors -"
YouTube Link 2023-04-17T21:22Z 234K followers, 65.5K engagements
"Fossil Data Part 2: 8-Inch IBM Floppy Data Recovery We help intrepid paleontologists to retrieve precious fossil data fossilized on 8-inch IBM floppies. Our sponsor for PCBs: https://www.pcbway.com Support the team on Patreon: https://www.patreon.com/curiousmarc Buy shirts on Teespring: https://teespring.com/stores/curiousmarcs-store Learn more on companion site: https://www.curiousmarc.com Contact info: https://www.youtube.com/curiousmarc/about Music Credits: Crinoline Dreams Kevin MacLeod https://incompetech.com"
YouTube Link 2020-02-22T05:34Z 234K followers, 170K engagements
"How to check the paper tape reader on your new HP [----] computer This HP 1000E minicomputer belongs to Jack Rubin a vintage computer collector and friend from the Chicago area. Ill do a follow up video oriented the right way when Im back in California. #shorts"
YouTube Link 2022-04-09T04:09Z 234K followers, 49.3K engagements
"Divide by Zero on the Friden STW10 Mechanical Calculator Please try a divide by zero Pleeeeeease What would happen What if Katherine Johnson did that in the movie Hidden Figures (this is the Friden that sits on her desk) Would it catch fire Would the rocket trajectory go to infinity Now you are finally going to find out. Stick to the end for a little extra a scene from another great movie that stars the Friden. This is a Friden STW [--] from [----]. Friden Calculator Playlist: https://youtube.com/playlistlist=PL-_93BVApb5_GbzkFwdKpuyPo8Ty83h8b More about the Friden STW10 on my website:"
YouTube Link 2016-06-14T05:26Z 234K followers, 2.9M engagements
"Bendix Air Data Computer - Part 3: Intro to Synchros We delve into synchros a magical angular sensor and actuator that predates electronics is prevalent in our electro-mechanical computer and is still used to this day. Bendix MG-1 Restoration Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb59k-GD2e83E6prrhm5fobtV Stuff that supports the channel: - Amazon links for the tools I use in the lab (supports the channel if you buy from there) https://www.curiousmarc.com/amazon-links - Channel merch on Teespring: https://teespring.com/stores/curiousmarcs-store - Support us on Patreon:"
YouTube Link 2023-04-25T18:29Z 234K followers, 62.6K engagements
"Booting the HP 1000E Vintage Computer at the Computerarium I just visited my friend Jack Rubin and his well named Computerarium. Today we are going to boot an HP 1000E (from 1976) and have it run a simple test on its paper tape reader. How hard can it be Link to Jacks Computerarium web page: https://www.computerarium.org Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - Electro-Rent: https://www.electrorent.com - Keysight: test instruments: https://www.keysight.com - Samtec: connectors: https://www.samtec.com Support the team on Patreon: https://www.patreon.com/curiousmarc Buy"
YouTube Link 2022-04-30T23:14Z 234K followers, 75K engagements
"Apollo Guidance Computer Part 2: Power supplies test Mike Stewart gives an overview of the hardware. Enamored by the success at checking the IC gates we proceed to check out and power up the supplies. Once again a long-ish video but I hesitate to chop it up too much for fear of losing details that might be important to some. Let me know how I am doing. Frequent comment answers: Yes we know about Francois Rautenbach and the Block I core ropes (https://youtu.be/WquhaobDqLU). These ropes are also from Jimmie and not compatible with our Block II computer Yes we are in contact with Fran"
YouTube Link 2018-11-18T00:10Z 234K followers, 183.6K engagements
"Bendix Air Data Computer - Part 1: First Look Inside We open up an amazing jet fighter analog computer made out of gears. Stuff that supports the channel: - Amazon links for the tools I use in the lab (supports the channel if you buy from there) https://www.curiousmarc.com/amazon-links - Channel merch on Teespring: https://teespring.com/stores/curiousmarcs-store - Support us on Patreon: https://www.patreon.com/curiousmarc Bendix MG-1 Restoration Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb59k-GD2e83E6prrhm5fobtV Dave Jones opening of a B-52 star tracker analog computer:"
YouTube Link 2023-02-03T23:25Z 234K followers, 160.2K engagements
"Apollo Comms Part 5: Transponder first power on. It's aliiive We very cautiously turn on our transponder for the first time. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to doc: https://www.curiousmarc.com/space/apollo-s-band-communications https://virtualagc.github.io/virtualagc/QuestForInfo.html https://www.ibiblio.org/apollo/ Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - Keysight: test instruments: https://www.keysight.com - Samtec: connectors: https://www.samtec.com Support the team on Patreon:"
YouTube Link 2021-11-29T23:52Z 234K followers, 61.1K engagements
"Apollo Comms Part 25: Apollo-HP Nixie Space Clock We power up Apollo's capsule Central Timing Equipment and marry it to a modified HP 5327B counter to make a Nixie tube space clock. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to doc: https://www.curiousmarc.com/space/apollo-s-band-communications https://virtualagc.github.io/virtualagc/QuestForInfo.html https://www.ibiblio.org/apollo/ Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - ElectroRent: https://www.electrorent.com - Keysight: test instruments:"
YouTube Link 2023-03-11T20:35Z 235K followers, 67.9K engagements
"Fourth HP 5061A atomic clock repair: revisiting a clock that showed parts per trillion instability We revisit a previous Cesium clock that we had repaired but still showed some residual time instability in the parts per trillion range. And yes atomic time can be ruined by a simple switch. Who would have known. HP Atomic Clock playlist: https://www.youtube.com/playlistlist=PL-_93BVApb59F6V90OdcqVofqVWceR6Dk Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links -"
YouTube Link 2026-01-11T20:28Z 238K followers, 46.5K engagements
"Apollo Comms Part 3: Inside the S-Band Transponder We take a closer look at the S-Band transponder from the Apollo command module and marvel at the [--] transmitters and receivers it contains. The transponder was manufactured by Motorola and is entirely solid-state. 0:00 Recap of previous episodes 1:56 Overall block diagram 5:49 Looking inside 11:18 Detailed explanation (with elevator music) 16:28 Every wire of the transponder explained (in technicolor) Full Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to doc:"
YouTube Link 2021-11-07T20:25Z 234K followers, 91.1K engagements
"MMD [--] Mini Micro Designer Part 3: Restoring our 2nd unit the WRONG way We take on our second E&L MMD-1 microcomputer unit. It's not in good shape. Don't try to restore it like we did. MMD-1 Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5_ITRdT7BjqpjQfCqc58O-g Project Documentation: https://www.curiousmarc.com/computing/mmd-1-intel-8080-trainer Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2025-10-29T07:00Z 238K followers, 25.8K engagements
"HP 115BR Divider and Clock - Part 3: Startup and Atomic Sync It's all working now We take you through the complicated alignment procedure and atomic sync of our steampunk HP 115BR divider and clock. HP 115BR Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5-_7sWRxQ0on8vNy7_H-zxS Atomic clock playlist: https://youtube.com/playlistlist=PL-_93BVApb59F6V90OdcqVofqVWceR6Dk Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2024-11-14T08:30Z 234K followers, 41.7K engagements
"Visiting the Computer Museum of America After VCF East we were invited for a very special visit of the Computer Museum of America near Atlanta Georgia. Comes with us for a tour Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): https://teespring.com/stores/curiousmarcs-store "Elevator Music" Credit:"
YouTube Link 2024-07-15T20:15Z 235K followers, 44.1K engagements
"Debugging the [----] IBM [----] Computer at the Computer History Museum A little behind the scenes look at what it takes to keep the two giant IBM [----] "Compusaurs" running at the computer history museum. Today the tape drives decided not to work. The IBM [----] introduced in [----] is one of the first transistorized computers and certainly the most successful computer of the early 1960's: by [----] half of the world's computers were 1401's. Only two are known to be still functioning - and here they are. Compared to my humble restorations this is major hardware and it could not be done by one person"
YouTube Link 2015-10-04T07:08Z 234K followers, 127.9K engagements
"MMD [--] Mini Micro Designer Part 4: Restoring our 2nd unit the RIGHT way We restore our trashed MMD-1 to pristine condition the correct way this time. MMD-1 Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5_ITRdT7BjqpjQfCqc58O-g Project Documentation: https://www.curiousmarc.com/computing/mmd-1-intel-8080-trainer Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch"
YouTube Link 2025-10-30T08:00Z 238K followers, 25.5K engagements
"MMD-1 Mini Micro Designer Part 7: Running the original Microsoft BASIC We succeed in running the original [----] Microsoft BASIC on the MMD-1. That was WAY harder than expected MMD-1 Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5_ITRdT7BjqpjQfCqc58O-g Project Documentation: https://www.curiousmarc.com/computing/mmd-1-intel-8080-trainer Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2025-11-11T09:15Z 238K followers, 23.4K engagements
"MMD-1 Restoration - Part 2: breadboarding HP 5082-7340 displays bad RAM We continue the restoration of our E&L MMD-1 Mini Micro Designer a [----] Intel [----] based microcomputer. We take advantage of the integrated breadboard to add gorgeous HP 5082-7340 displays which ends up revealing some RAM problems. MMD-1 Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5_ITRdT7BjqpjQfCqc58O-g Project Documentation: https://www.curiousmarc.com/computing/mmd-1-intel-8080-trainer Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the"
YouTube Link 2025-10-24T04:45Z 238K followers, 26.1K engagements
"MITE Tactical Teleprinter - military digital communications from [----] We marvel at a MITE AN/TGC-14A(V) Teleprinter a miracle of teletype miniaturization from [----]. Imagine only [--] lbs Teletype model [--] restoration playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5-9eQLTCk9xx16RAGEYHH1q ASR33 Teletype restoration playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5-84G5kmgfuu7TQduTMc73H 3M Whisper Writer Telex: https://youtu.be/4ta-AWDALyY Stuff that supports the channel: - Amazon links for the tools I use in the lab (supports the channel if you buy from there)"
YouTube Link 2023-11-16T07:18Z 234K followers, 51.4K engagements
"MMD [--] Mini Micro Designer Part 5: Breadboarding FRAM memory We pimp up our MMD-1 by breadboarding 32K of non-volatile FRAM memory. Which turns out to be way more difficult than expected. Get fast turn PCBs from PCBWay: https://www.pcbway.com MMD-1 Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5_ITRdT7BjqpjQfCqc58O-g Project Documentation: https://www.curiousmarc.com/computing/mmd-1-intel-8080-trainer Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links -"
YouTube Link 2025-11-02T06:15Z 238K followers, 25.1K engagements
"Apollo Comms Part 9: Mystery Up-Data Link Test Set Marcel rescued a mystery box from the scrapper. Says "Up-Data" on it we think it's from the Apollo program. Can Master Ken figure out what it is More videos on the Apollo Up-data box: Sending Apollo Commands with the Up-data box: https://youtu.be/sv0aFLQvFxc Reimplementing the missing analog parts: https://youtu.be/iegf7ZU6ciM Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Fran's video on the edge-lit display: https://youtu.be/J2xAetY9O1E Links to doc:"
YouTube Link 2022-01-18T02:32Z 234K followers, 85.4K engagements
"More early 8" floppies: hard sectored IBM Minnow Intel Intellec and IBM Demi floppies We complete our early floppy diskette education by taking a look at a hard sectored 8" floppy an IBM Minnow floppy an IBM Demi Floppy and some oddly formatted Intel Intellec diskettes. Will we be able to recover the data Our previous video on 8" floppies: https://youtu.be/oL0LXSE1jeM Recovered IBM 370/135 IPL Minnow Diskette data: https://github.com/schlae/minnow-disk Applesauce Floppy Controller: https://applesaucefdc.com Stuff that supports the channel: - Amazon links for the tools I use in the lab"
YouTube Link 2023-03-23T06:48Z 235K followers, 52.8K engagements
"Apollo Comms Part 21: TV from the Moon Our first successful video transmission using the original Apollo comms hardware. And sadly we don't have a real Apollo moon camera so we have to cobble one together ourselves. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to doc: https://www.curiousmarc.com/space/apollo-s-band-communications https://virtualagc.github.io/virtualagc/QuestForInfo.html https://www.ibiblio.org/apollo/ Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - ElectroRent: https://www.electrorent.com -"
YouTube Link 2022-08-21T05:06Z 234K followers, 86.4K engagements
"1964 IBM [---] Keypunch Card Punching Demonstration Hard to believe but the old IBM [---] is fully restored and back in action This demo shows manual punching program-controlled punching fast duplication and interpreting which are the main features of the [---]. Everything works - almost. It still did miss an A in the interpret run in this video and occasionally misfeeds a card which I'll fix later. But it is completely usable now. Full [---] keypunch story in video series here: Part 0: https://youtu.be/Ey0FOmqONys (arrival and overview) Part 1: https://youtu.be/6XpR4cwCado (first power up) Part 2:"
YouTube Link 2014-09-07T20:58Z 238K followers, 376.3K engagements
"Apollo Comms Part 23: making connectors and a control panel We remake tricky connectors and a control panel. Shout-out to PCBWay https://www.pcbway.com for donating all the PCBs for this episode. Also thanks to Samtec https://www.samtec.com for donating the microcoax and connectors. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to doc: https://www.curiousmarc.com/space/apollo-s-band-communications https://virtualagc.github.io/virtualagc/QuestForInfo.html https://www.ibiblio.org/apollo/ Our sponsors - PCBWay: fast turn PCBs"
YouTube Link 2022-11-11T01:26Z 234K followers, 60.7K engagements
"Apollo Comms Part 16: Stanford Dishs Apollo Past We are treated to a very special tour of the nearby Stanford dish and find evidence of its participation to the Apollo program. Many thanks to viewer Steve Muther and SRI International. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to doc: https://www.curiousmarc.com/space/apollo-s-band-communications https://virtualagc.github.io/virtualagc/QuestForInfo.html https://www.ibiblio.org/apollo/ Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - ElectroRent:"
YouTube Link 2022-05-07T06:08Z 235K followers, 76.4K engagements
"1958 FACOM 128B Japanese Relay Computer still working 0:00 Intro 0:53 The FACOM 128B 1:53 History of relay computers 5:16 Trip to Mt Fuji and Fujitsu's Numazu plant 6:12 Detailed look at the FACOM 128B 10:33 Simple example: 3+3 deciphering the lights 12:49 Calculating square root of [--] 13:44 Crossbar mechanical memory 17:07 Large calculation demo 21:30 Maintenance 22:34 FACOM and the rise of Fujitsu 23:16 More footage of the 128B in action This FACOM 128B was designed in [----] and built in [----] and is part of Fujitsu's (and Japan's) first commercial computers series. It uses over [----] relays"
YouTube Link 2019-11-29T07:32Z 237K followers, 1.5M engagements
"We attend the Vintage Computer Festival (VCF East 2024) We had a great time at VCF East the annual vintage computer exhibit in Wall New Jersey. Carl was showing off an IBM [----] he just restored and we had a round table about the Apollo Guidance Computer restoration. But there is more: the Vintage Computer Federation museum with its working UNIVAC a military technology museum and even a prototype AGC The video of our AGC round table talk is available on the VCF channel: https://www.youtube.com/watchv=4Qx_XqnJtJw Stuff that supports the channel: - Amazon links for the tools I use in the lab:"
YouTube Link 2024-04-24T04:19Z 237K followers, 51.1K engagements
"CuriousMarc is on Gizmodo Much better Now right here on your tube: https://youtu.be/tJ2-kkhghD4 Come back here afterwards to post your likes and comments The talented Gizmodo video crew came to my basement to make a short piece about me for their new "Show Me Your Nerd" series. Perfect for me I have a lot of nerd to show. That was [--] hours of filming for [--] minutes of video but it shows in the result"
YouTube Link 2018-04-25T05:49Z 237K followers, [----] engagements
"Apollo Comms Part 6: First tone transmission to the Moon and back We demonstrate a locked bidirectional link between Earth and our Apollo transponder. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to doc: https://www.curiousmarc.com/space/apollo-s-band-communications https://virtualagc.github.io/virtualagc/QuestForInfo.html https://www.ibiblio.org/apollo/ Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - Keysight: test instruments: https://www.keysight.com - Samtec: connectors: https://www.samtec.com Support the"
YouTube Link 2021-12-02T07:39Z 234K followers, 66.1K engagements
"Apollo Comms Part 12: Building an Apollo transmit station with Keysight instruments Thanks to ElectroRent we get a big pile of modern Keysight test instruments and recreate a full Apollo uplink. Link to ElecroRent: https://www.electrorent.com Link to Keysight: https://www.keysight.com Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to doc: https://www.curiousmarc.com/space/apollo-s-band-communications https://virtualagc.github.io/virtualagc/QuestForInfo.html https://www.ibiblio.org/apollo/ Our sponsors - PCBWay: fast turn PCBs"
YouTube Link 2022-02-28T06:02Z 234K followers, 49.7K engagements
"HP Switching Power Supply Repair Part 4: Repaired Here is part [--] of our HP switched mode power supply epic debug. We recover from our previous ElectroBOOM disaster and bring our power supply and precious HP 85645A instrument back to life. But not without an extra deep dive into the double feedback control loop. SMPS repair playlist: https://www.youtube.com/playlistlist=PL-_93BVApb59nSZU0aixrapvAie5kcllE Our sponsor for PCBs: https://www.pcbway.com Support the team on Patreon: https://www.patreon.com/curiousmarc Buy shirts on Teespring: https://teespring.com/stores/curiousmarcs-store Learn"
YouTube Link 2020-05-24T20:15Z 234K followers, 45K engagements
"Apollo Guidance Computer Part 28: real DSKY display works again after [--] years For the first time in about [--] years we relight a real Apollo DSKY screen And we can finally see the mythical glow in person. Much to our collective surprise the screen is stupendously good - it could pass for a modern high resolution phone screen. We thank our sponsor Samtec for fabricating the NASA-spec connector pins and of course Marcel for lending us just not one but two of his precious displays. Chapters: 00:00 Intro Apollo DSKY relight short 01:27 What's an Apollo DSKY 02:51 Block I and Block II DSKY 07:18"
YouTube Link 2021-07-27T23:31Z 234K followers, 248.7K engagements
"Viewer-designed Tauntek TTL IC tester We build and test the very excellent Tauntek Logic IC Tester kit designed by viewer Robert Grieb. We also compare it to the great MiniPro TL866. http://www.tauntek.com/LogICTester-low-cost-logic-chip-tester.htm Music Credits: "The Legend of Zelda: A Link to the Past Ten Rupees" by Neskvartetten on ocremix: https://ocremix.org/remix/OCR01408 Our sponsor for PCBs: https://www.pcbway.com Support the team on Patreon: https://www.patreon.com/curiousmarc Buy shirts on Teespring: https://teespring.com/stores/curiousmarcs-store Learn more on the companion site:"
YouTube Link 2021-08-25T05:58Z 234K followers, 40.3K engagements
"Apollo Comms Part 29: Downvoice We back out the last remaining modification from our NASA receiver and return it to its original Apollo voice channel. If we are successful we'll get to hear the voice from the astronauts the exact same way it was transmitted during the missions. And I hopelessly butchered the name of our hero engineer that left the helpful notes on the equipment it's Frank Landspurg not David Landsman Bravo Mr. Landspurg. His obituary says that he was working for Motorola and supporting the Apollo missions and passed away in [----]. Apollo Comms Playlist:"
YouTube Link 2023-12-22T06:19Z 234K followers, 72.8K engagements
"Apollo Core Rope Memory (Apollo Guidance Computer Part 30) Core Rope Memory which contained the programs that landed man on the Moon in the 1960s is insanely complicated. But that won't stop Mike from making a custom reader for it so he can recover Apollo Guidance Computer programs lost to history. Mike Stewart's Core Rope Visualizer: http://apolloguidance.computer/rope/ Apollo Guidance Computer Restoration Playlist: https://youtube.com/playlistlist=PL-_93BVApb59FWrLZfdlisi_x7-Ut_-w7 Core Memory Videos: https://youtu.be/AwsInQLmjXc https://youtu.be/7ozNMgx7WtQ https://youtu.be/e9ih93tuH1k"
YouTube Link 2023-10-27T20:28Z 235K followers, 711.1K engagements
"Apollo Comms Part 18: Solving the mystery of NASA's Updata Link box missing parts We fix our Updata Link Test box by solving the mystery of the missing analog components. We X-ray mysterious Motorola modules fight with misbehaving LC circuits and help 1960's circuits with a dose of 1970's technology. Ken's blog article about the X-ray reverse engineering of the Motorola modules: https://www.righto.com/2022/06/x-ray-reverse-engineering-hybrid-module.html Eric's new book see first chapter: https://nostarch.com/open-circuits Order on Amazon:"
YouTube Link 2022-07-03T01:27Z 234K followers, 57.6K engagements
"Friden STW [--] Mechanical Calculator Demo Yes this [----] Friden STW10 is the calculator machine on the desk of Katherine Johnson in the movie Hidden Figures. Let's try it out it's way more impressive than in the movie (I suspect theirs didn't work fully). If you want a fun demo that's less of lecture see the "dividing by zero" video instead: https://youtu.be/7Kd3R_RlXgc Friden Calculator Playlist: https://youtube.com/playlistlist=PL-_93BVApb5_GbzkFwdKpuyPo8Ty83h8b More about the Friden STW10 on my website: https://www.curiousmarc.com/mechanical/friden-stw-10-mechnical-calculator Our sponsor for"
YouTube Link 2014-11-03T06:57Z 234K followers, 164.4K engagements
"Apollo Comms Part 27: Quindar Tones Microphone Hack Nothing is more emblematic of the Apollo communications than the Quindar tones which you hear at the beginning and end of each transmission. In this episode we hack a cheap commercial microphone to bring it up to NASA standards by adding the tones. After explaining what they do of course. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Project notes and schematics: https://www.curiousmarc.com/space/quindar-tone-generator Links to doc:"
YouTube Link 2023-04-29T07:00Z 234K followers, 70K engagements
"MMD-1 Mini Micro Designer Part 8: Chatting with the original designers In this final episode we chat with Jon Titus the Mark [--] and MMD-1 designer and his business partner David Larsen owner of the Blacksburg group creator of the Bugbooks franchise and avid computer collector. MMD-1 Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5_ITRdT7BjqpjQfCqc58O-g Project Documentation: https://www.curiousmarc.com/computing/mmd-1-intel-8080-trainer Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab:"
YouTube Link 2025-11-13T08:24Z 238K followers, 17.1K engagements
"Happy New Year upcoming projects and an award from PCBWay A short belated video wishing you a Happy New Year [----] an acknowledgment of our sponsor PCBWay and highlights of upcoming projects made thanks to their help. PCBWay: fast turn PCBs https://www.pcbway.com My shared PCBWay projects: https://www.pcbway.com/project/member/bmbno=E210F4D2-A0FF-4A Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2026-01-03T09:21Z 238K followers, 14.1K engagements
"Apollo Talkback "Barber pole" Indicator We try to make an Apollo talkback indicator work again the ones that go either "grey" or "barber pole" on the control panel. Things don't quite go according to plan. Links to schematics: CSM [---] Systems Handbook: https://www.ibiblio.org/apollo/Documents/HSI-481260.pdf CSM Functional Integrated Schematics Block II rev. K: https://www.ibiblio.org/apollo/Documents/CSM%20Functional%20Integrated%20System%20Schematics%20Block%20II%20Revision%20K.pdf Links to more doc: https://www.curiousmarc.com/space/apollo-s-band-communications"
YouTube Link 2025-11-24T01:55Z 238K followers, 89.2K engagements
"Apollo Comms Part 14: Reverse Engineering NASA's Up Data Link test box Our sponsor PCBWay: fast turn PCBs https://www.pcbway.com We send digital commands to the spacecraft. We can even hear how they sound Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Chapters: 0:00 Intro 2:10 Ken's automated reverse engineering machine 5:32 Ken explains his findings 9:14 Apollo commands explained (with elevator music) 17:02 Examining the sub-bits 20:00 Replacing our missing PSK circuits with HP equipment 23:16 We transmit and hear our first commands"
YouTube Link 2022-03-24T22:02Z 234K followers, 67.7K engagements
"MMD-1 Mini Micro Designer Part 6: Breadboarding a homebrew serial port In our quest to run Microsoft BASIC on the MMD-1 we add an Altair-compatible serial port using a vintage MC6850 chip. MMD-1 Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5_ITRdT7BjqpjQfCqc58O-g Project Documentation: https://www.curiousmarc.com/computing/mmd-1-intel-8080-trainer Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2025-11-07T03:45Z 238K followers, 22.7K engagements
"Apollo [--] Source Code: The Art of Commenting Mike has gotten hold of an original listing of the Apollo [--] source code. We look at what might be some of the best ever commenting embedded into historically significant Apollo code courtesy of AGC programmer Don Eyles. T-shirt and Hoodie about good commenting habits inspired by this episode: https://teespring.com/thou-shalt-comment-code-proper The scan of the Luminary [--] listing from this video is available here: https://archive.org/details/luminary6900miti/mode/2up Links to other versions of Luminary from Ron Buckley Virtual AGC Website:"
YouTube Link 2020-06-03T07:19Z 234K followers, 371.2K engagements
"Explaining the Apollo hardware on display at Seattle's Museum of Flight The superb Apollo exhibit at Seattle's Museum of Flight teaches us a few things about the Apollo command module the F-1 Rocketdyne engine the lunar rover and more that we didn't know. Apollo Comms Restoration playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Apollo Guidance Computer Restoration playlist: https://youtube.com/playlistlist=PL-_93BVApb59FWrLZfdlisi_x7-Ut_-w7 Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - Electro-Rent: https://www.electrorent.com -"
YouTube Link 2022-11-28T05:45Z 234K followers, 58.8K engagements
"Playing with Cathode Ray Tubes (CRT): Explanation and Experiments We explain how Cathode Ray Tubes (CRTs) were invented and how they work and hook up a few to light them up. They are as intimidating as they are awesome. But did you know that they led to the discovery of the electron and the birth of a new field electronics And of course the invention of the oscilloscope and modern TV Link to Eric's scope clock design info: https://github.com/schlae/crt-driver Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - Electro-Rent: https://www.electrorent.com - Keysight: test instruments:"
YouTube Link 2022-09-12T22:32Z 237K followers, 164.4K engagements
"Apollo Comms Part 15: Combining Voice Data and Ranging We demonstrate the full Apollo uplink with simultaneous voice data and ranging as seen and demodulated on the Keysight MXA signal analyzer. Many thanks to Electro-Rent for sponsoring the Keysight equipment rental ElectroRent: https://www.electrorent.com Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb The USB vacuum tube key shown in the video by Slava Tech on Etsy (no affiliation): https://www.etsy.com/listing/182518503/handmade-163264128256512gb-orange Links to doc:"
YouTube Link 2022-03-28T07:36Z 234K followers, 43.1K engagements
"Rejuvenating a color CRT Our dumpster rescue Sony Trinitron monitor is very tired and all purple. Can we bring it back to life with CRT rejuvenation Previous video explaining CRTs: https://youtu.be/zqUlfMmhJQs Our sponsors - PCBWay: fast turn PCBs https://www.pcbway.com - Electro-Rent: https://www.electrorent.com - Keysight: test instruments: https://www.keysight.com - Samtec: connectors: https://www.samtec.com - R&D Microwaves: https://rdmicrowaves.com Support the team on Patreon: https://www.patreon.com/curiousmarc Buy our merch on Teespring: https://teespring.com/stores/curiousmarcs-store"
YouTube Link 2022-12-01T05:01Z 237K followers, 65.2K engagements
"Apollo Comms Part 38: Return of the AGC (we hook up our Apollo Guidance Computer to our comms setup) We hook up the AGC to our communications setup and it starts sending data back to earth. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to schematics: CSM [---] Systems Handbook: https://www.ibiblio.org/apollo/Documents/HSI-481260.pdf CSM Functional Integrated Schematics Block II rev. K: https://www.ibiblio.org/apollo/Documents/CSM%20Functional%20Integrated%20System%20Schematics%20Block%20II%20Revision%20K.pdf Links to more doc:"
YouTube Link 2026-02-15T06:03Z 238K followers, 33.5K engagements
"Our Strobotac gets a [----] Flash Delay and a Homebrew Optical Probe In this second installment of our Genrad Strobotac repair we repair its companion Tupe 1531-P2 Time Delay with very yucky capacitors in it and make an optical probe for it. Part [--] of the Strobotac repair: https://youtu.be/6zEnetFmy00 Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't"
YouTube Link 2026-02-04T07:30Z 238K followers, 27.8K engagements
"2025 CuriousMarc Channel Rewind Just a quick retrospective on what we achieved in [----]. Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): https://teespring.com/stores/curiousmarcs-store "Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod Our lovely sponsors - PCBWay: fast turn PCBs"
YouTube Link 2026-01-16T09:44Z 238K followers, 19.3K engagements
"Fourth HP 5061A atomic clock repair: revisiting a clock that showed parts per trillion instability We revisit a previous Cesium clock that we had repaired but still showed some residual time instability in the parts per trillion range. And yes atomic time can be ruined by a simple switch. Who would have known. HP Atomic Clock playlist: https://www.youtube.com/playlistlist=PL-_93BVApb59F6V90OdcqVofqVWceR6Dk Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links -"
YouTube Link 2026-01-11T20:28Z 238K followers, 46.5K engagements
"HP 182C (and 180C/D) Oscilloscope Repair - Part 6: HP 1805A and 1825A [---] MHz Plugins We take advantage that our HP 182C oscilloscope frame is calibrated and that the underside is opened to repair the [---] MHz plugins from my other HP 180C frame. Fortunately it's a less involved repair than the previous plugins but still sneaky faults they were. And those switches I hate those switches. HP [---] Repair Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb58rsjI0icp8-iY0SWT_n8aA Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for"
YouTube Link 2026-01-06T07:45Z 238K followers, 28.7K engagements
"Apollo Comms Part 37: Apollo's weirdest (but genius) analog circuit In this brain numbing episode we explore a genius circuit that defies our modern understanding of analog electronics. It's the analog multiplexer used in the Apollo telemetry box that we recently hooked up. After we build it not only does it work great but it teaches us a few things Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to schematics: CSM [---] Systems Handbook: https://www.ibiblio.org/apollo/Documents/HSI-481260.pdf CSM Functional Integrated Schematics"
YouTube Link 2026-01-04T06:15Z 238K followers, 179.1K engagements
"Happy New Year upcoming projects and an award from PCBWay A short belated video wishing you a Happy New Year [----] an acknowledgment of our sponsor PCBWay and highlights of upcoming projects made thanks to their help. PCBWay: fast turn PCBs https://www.pcbway.com My shared PCBWay projects: https://www.pcbway.com/project/member/bmbno=E210F4D2-A0FF-4A Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2026-01-03T09:21Z 238K followers, 14.1K engagements
"Genrad Strobotac Repair We repair a tube-based stroboscope from the 1950s the infamous Strobotac Type [----] by General Radio. Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): https://teespring.com/stores/curiousmarcs-store "Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod Our lovely sponsors -"
YouTube Link 2025-12-31T08:50Z 238K followers, 33.2K engagements
"Apollo Comms Part 36: PCM pinout discovery saved by "SCE to AUX" We need to figure out where over [---] inputs should hook up to our Apollo PCM Telemetry box. Little did we know the SCE of "switch SCE to AUX" fame on Apollo [--] will save our butts once again. Apollo Comms Playlist: https://www.youtube.com/watchv=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb Links to schematics: CSM [---] Systems Handbook: https://www.ibiblio.org/apollo/Documents/HSI-481260.pdf CSM Functional Integrated Schematics Block II rev. K:"
YouTube Link 2025-12-10T07:00Z 238K followers, 57K engagements
"Apollo Talkback "Barber pole" Indicator We try to make an Apollo talkback indicator work again the ones that go either "grey" or "barber pole" on the control panel. Things don't quite go according to plan. Links to schematics: CSM [---] Systems Handbook: https://www.ibiblio.org/apollo/Documents/HSI-481260.pdf CSM Functional Integrated Schematics Block II rev. K: https://www.ibiblio.org/apollo/Documents/CSM%20Functional%20Integrated%20System%20Schematics%20Block%20II%20Revision%20K.pdf Links to more doc: https://www.curiousmarc.com/space/apollo-s-band-communications"
YouTube Link 2025-11-24T01:55Z 238K followers, 89.2K engagements
"MMD-1 Mini Micro Designer Part 8: Chatting with the original designers In this final episode we chat with Jon Titus the Mark [--] and MMD-1 designer and his business partner David Larsen owner of the Blacksburg group creator of the Bugbooks franchise and avid computer collector. MMD-1 Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5_ITRdT7BjqpjQfCqc58O-g Project Documentation: https://www.curiousmarc.com/computing/mmd-1-intel-8080-trainer Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab:"
YouTube Link 2025-11-13T08:24Z 238K followers, 17.1K engagements
"MMD-1 Mini Micro Designer Part 7: Running the original Microsoft BASIC We succeed in running the original [----] Microsoft BASIC on the MMD-1. That was WAY harder than expected MMD-1 Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5_ITRdT7BjqpjQfCqc58O-g Project Documentation: https://www.curiousmarc.com/computing/mmd-1-intel-8080-trainer Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2025-11-11T09:15Z 238K followers, 23.4K engagements
"MMD-1 Mini Micro Designer Part 6: Breadboarding a homebrew serial port In our quest to run Microsoft BASIC on the MMD-1 we add an Altair-compatible serial port using a vintage MC6850 chip. MMD-1 Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5_ITRdT7BjqpjQfCqc58O-g Project Documentation: https://www.curiousmarc.com/computing/mmd-1-intel-8080-trainer Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2025-11-07T03:45Z 238K followers, 22.7K engagements
"MMD [--] Mini Micro Designer Part 5: Breadboarding FRAM memory We pimp up our MMD-1 by breadboarding 32K of non-volatile FRAM memory. Which turns out to be way more difficult than expected. Get fast turn PCBs from PCBWay: https://www.pcbway.com MMD-1 Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5_ITRdT7BjqpjQfCqc58O-g Project Documentation: https://www.curiousmarc.com/computing/mmd-1-intel-8080-trainer Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links -"
YouTube Link 2025-11-02T06:15Z 238K followers, 25.1K engagements
"MMD [--] Mini Micro Designer Part 4: Restoring our 2nd unit the RIGHT way We restore our trashed MMD-1 to pristine condition the correct way this time. MMD-1 Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5_ITRdT7BjqpjQfCqc58O-g Project Documentation: https://www.curiousmarc.com/computing/mmd-1-intel-8080-trainer Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall: https://curiousmarc-shop.fourthwall.com - Legacy channel merch"
YouTube Link 2025-10-30T08:00Z 238K followers, 25.5K engagements
"MMD [--] Mini Micro Designer Part 3: Restoring our 2nd unit the WRONG way We take on our second E&L MMD-1 microcomputer unit. It's not in good shape. Don't try to restore it like we did. MMD-1 Playlist: https://www.youtube.com/playlistlist=PL-_93BVApb5_ITRdT7BjqpjQfCqc58O-g Project Documentation: https://www.curiousmarc.com/computing/mmd-1-intel-8080-trainer Stuff that supports the channel: - Support us on Patreon: https://www.patreon.com/curiousmarc - Amazon links for the tools I use in the lab: https://www.curiousmarc.com/amazon-links - Channel merch on Fourthwall:"
YouTube Link 2025-10-29T07:00Z 238K followers, 25.8K engagements
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