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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[–] AllNewTypeFace@leminal.space 0 points 6 months ago (1 children)

Silicon foundries use a lot of water and raw materials and contaminate the ground. Full degrowth may involve abandoning semiconductor technologies and making computers out of simpler parts, such as electromagnetic relays. They’ll be a lot slower and simpler, but with the right knowledge, one can make them from raw materials without bootstrapping a complex technology chain.

[–] Trainguyrom@reddthat.com 1 points 6 months ago

abandoning semiconductor technologies and making computers out of simpler parts

I remember reading an article a while back about basically computing using cards which block or allow light to flow as a series of logic gates. Another way to think of it is reinventing the punch card.