Ben eater did an excellent series on YouTube where he built a CPU from scratch on breadboards: https://m.youtube.com/playlist?list=PLowKtXNTBypGqImE405J2565dvja

Ben eater did an excellent series on YouTube where he built a CPU from scratch on breadboards: https://m.youtube.com/playlist?list=PLowKtXNTBypGqImE405J2565dvjafglHU https://m.youtube.com/playlist?list=PLowKtXNTBypGqImE405J256... His channel has a lot of other really great stuff on general electronics as well.