Just wanted to add that there is "a homebrew computer ring" project [1] and you will be surprised how many ideas for DIY computers you can find there. (I also

Just wanted to add that there is "a homebrew computer ring" project [1] and you will be surprised how many ideas for DIY computers you can find there. (I also made a two-breadboard CPU with ~5 instructions myself but had yet no time to finish the software) [1] https://www.homebrewcpuring.org/ https://www.homebrewcpuring.org/