I got more old computer stuff | Unfridging No. 4
9,644
Published 2023-09-01
00:00 Intro
01:54 Martin Research Microcomputer Design book
08:37 Digikit 8/16 Brochures
13:58 Homebrew S100 Computer
17:55 digital group Flyers
30:37 Terra Systems 1010 CP/M portable computer
35:22 JUDGE digital group user newsletter
37:38 Digikit Reaction Tennis game
46:25 Prototype Z80 computer or terminal
51:03 DRC ZRT-80 single board terminal
52:17 Trimmer resistors for 1974 terminal
54:59 MITS 1200 Calculator PCBs
55:51 Unbuilt Electronic Systems Modem Kit
57:48 Unbuilt Electrolabs ESAT E200 board
59:10 Microsysteme Mazel II single board computer
1:01:15 IBM PS/2 L40 laptop
1:08:33 Soviet ZX81 Clone
1:11:58 Syquest S306r 5mb removable hard disk drive
1:14:45 "Robot Stack's" Unsolved Mysteries appeal for 5mb cartridges
1:15:16 IBM YD-380 1.2mb floppy (unused?)
1:16:39 Conclusion
1:17:11 Dislike Copter
Martin Research Microcomputer Design book: www.jkearney.com/8008/Microcomputer_Design.pdf
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All Comments (21)
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This is a long one.. I've put in chapters so everyone can jump around or come and go as they want to. Cheers!
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I have to say it makes me really happy seeing other people beeing so hyped about the stuff they got and saving history in the process !
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You know you are getting old when the first laptop you ever used in your job ( the IBM laptop) pops up in a vintage computing video.
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I built a reaction tennis game similar to the one in your video when I was in high school. The Magnavox company in my town sponsored an Explorer Scout program for future engineers in the late 70's. The big difference for us was we were given the task of laying out our PCB with tape on Mylar film. Unfortunately, mine eventually was thrown away, for whatever reason. Just one of the many experiences that sent me on my career path in electronics.
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Regarding the "Apple 1 Motherboard": Way back in the day when I got my brand new VIC 20 the local computer store had some cartridge port expanders that were labeled as motherboards. Basically it was a circuit board with the edge connectors and switches to change which one was enabled.
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My dad was a digital engineer in the memory department. he kept a lot of the things he worked on for me to play with so we have buckets of boards in our basement. I should let him know they might be worth something... and feel kind of bad for playing with them as a kid. He also kept a few of the dev models, including a display of the first solid state drive he built.
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It's been a true delight to watch. Thanks a lot!
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The horizontal-mount potentiometers should be adaptable to vertical installation. I hacked those up plenty of times in the late 80s. Straighten the two legs, and solder a wire to the wiper terminal to make a third leg. The two big wiper legs can be cut off. If you do it carefully nobody will even notice unless they know what to look for.
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Interesting to see so many Western parts in that ZX clone, and it looks to be very early. The chips marked "T" are from Tungsram.
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That IBM PS2 laptop was pretty cool
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LOL the Unsolved Mysteries bit!!! 😂❤
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I really enjoy seeing whatever piece of old tech you've managed to get your hands on in these unfridging videos and I found the Unsolved Mysteries inclusion to be hilarious!
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I love the robots from Impossible Mission in the chyron!
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I've never seen a Syquest 5mb. We accepted 44, 88 and 200mb disk at the printing company I worked at when they were popular. They weren't known for reliability and came in foam case, in the event they were dropped.
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When you really learn what is going on in a computer. I mean, everyone kind of gets it, i am not saying you don’t really know… but when you really nail it down and wrap your mind around it. You’ll look at the world differently… it’s amazing any of it works at all.
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Wire wrap work requires a younger brain and eyes than mine.
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As soon as I saw the ports on the back of that Z80 Prototype computer I was thinking it was part of a PoS system... Those look similar to the connectors used by IBM/Toshiba before everything became RS-485 and USB.
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Bishop graphics made those precut templates to make the PCBS
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I had one of those White/DRC terminal boards connected to a Cherry keyboard installed in a SWTPc CT-1024 cabinet back in the early 1980's. Quite a Franken-Terminal. It worked pretty well though. I used on my ATR8000 CP/M computer.
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The point of sale computer board is definitely point-of-sale! Those weird connectors on one side are what POS people use so that end users can’t really connect any random cable into those ports. You’ll still see those kind of oddball connectors on older POS terminals still in use. That one must have been a beast - the 512k of RAM must have held a local copy of the transaction log and perhaps the PLU lookup table. A wonderful bit of history there!
