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PiDP-8 update #4, assembly nearing completion, save some mounting of stuff in a more robust way.
OS/8 is running, lights are lighting and the stop switch halts the CPU, allowing you to single-step instruction by instruction. Don't try that on your Core i7!
I'll finish it off and we can take a look at a few of the programs we used to think were amazing back in the day
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At the graphics console of a DEC PDP 8, 1970Â
The PDP-8 is a 12-bit minicomputer that was produced by Digital Equipment Corporation (DEC). It was the first commercially successful minicomputer, with over 50,000 units being sold over the model's lifetime
Release date - March 22, 1965
Introductory price - $18,500, equivalent to about $150,100 in 2019
Ferromagnetic Core Memory
64x64 bit ferrite ring (core memory) memory that can store 4096 bits of information. In the 50's and 60's, computers the size of a room had such memories. They were usually handmade.
The picture above shows the memory used in the Russian Saratov-2 (PDP-8 copy) computer. Check these out too if you are interested in retro computing
Digital Equipment Corporation PDP-8
Computer History Museum - Mountain View, CA
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source: https://www.reddit.com/r/retrobattlestations/comments/e91klp/a_long_time_in_the_making_my_dec_pdp8e_lab8e/?utm_source=share&utm_medium=web2x
222 votes and 32 comments so far on Reddit
PiDP-8 build update #3, it's alive!
I only managed to mess up 3 LEDs somehow but a little solder wick and plunger vacuum rework later it's all good lol.
Switches are next and final assembly.
(Hope y'all like a bunch of old DEC PDP8 nostalgia posts, it was the first computer I ever programmed and this project is taking me back big time lol)
