“Hello world” from scratch on a 6502 (2019) [video]
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He also made a series [0] where he built the CPU, microcode and all using logic gates and components. As a pure software guy I found it very enlightening.
I've been told the YouTube algorithm essentially rewards content creators for quantity over quality. Ben Eater seems to only post once a month but every single video is exceptionally high quality.
I've followed his videos from making logic gates with individual components, through making a whole computer with breadboards to the current series of programming a breadboard computer.
Each video is so pared back and well explained. It really dawned on me when he recently started discussing assembly and it just seemed like such a high level language.