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.
Oh Ben Eater? He’s got a fairly large following and his other 6502 breadboard computer series is super relevant to this forum
Yeah, I found his videos by jumping down a 6502 rabbit hole.