@neauoire I just wanted to talk a little about the Gigatron TTL microcomputer¹: it has a 8-bit CPU made out of a handful of TTL logic chips, with 17 instructions (see picture). This hardware runs a virtual machine that emulates a 34 instructions CPU² to run the real programs :D It manages to do so and produces a VGA signal and a (very noisy) audio output, and it has a gamepad input too!
I got a kit and built it and I still marvel at it!
²: https://raw.githubusercontent.com/kervinck/gigatron-rom/master/Docs/vCPU-summary.txt
¹: https://gigatron.io/
@Hiro I've seen it before, it's a nice little kit :) Thanks for adding it to the thread, I'm sure others will find it interesting too who come across it.