this post was submitted on 03 May 2024
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retrocomputing

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8-Bit Homebrew Processor (social.jlamothe.net)
submitted 6 months ago by me@social.jlamothe.net to c/retrocomputing@lemmy.sdf.org
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So, this isn't exactly retrocomputing and it looks like it's from four years ago, but I just found it and thought that many here may find it interesting.

This guy built a simple 8-bit CPU out of essentially discrete logic circuits (from what I've see so far, nothing more complex than a 4-bit adder chip) and explained the entire process.

youtube.com/playlist?list=PLow…

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[–] screwtape@mastodon.sdf.org 5 points 6 months ago (6 children)

@me @retrocomputing

  1. extremely cool
  2. The thing is, while rolling back experienced computer performance/degrowthing computing clearly has to happen
    I think hand-wired 8 bit computing is an educational rather than practical thing. (Obviously 8 bit AVR MCUs are a practical thing). 32 bit physical lisp machines on fpgas! (Eventually)
[–] curtosis@mastodon.social 2 points 6 months ago (2 children)

@screwtape @me @retrocomputing Tbh if you’re gonna go FPGA, why not go 36-bit and keep the tag bits? (This is what I keep thinking of doing, anyway.)

[–] screwtape@mastodon.sdf.org 2 points 6 months ago* (last edited 6 months ago) (1 children)

@curtosis
Unlike me, you should talk to @amszmidt. What do you think about the existing port/emulation of the 1985 LM-3 #MITCADR to #HDL as a starting point for a modern lisp computer (instead of the scheme things that happen sometimes)? (I've tried and failed to get involved because of excuses. ;_;).

I forgot the LM discussion of Actually Using The Extra Bits Available.
@me @retrocomputing

[–] curtosis@mastodon.social 2 points 6 months ago

@screwtape @amszmidt @me @retrocomputing I do vaguely recall it was an interesting question, though not the details. I will admit at least partial interest in the Because I Can factor of historical recreation. ;-)

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