Lovely piece of digital archaeology. Reverse-engineering a Classic Mac era device is equal parts patience and respect for old constraints. What stood out to me is how much implicit knowledge was baked into drivers back then, timing assumptions, undocumented commands, “it just works on System 7”. Also a good reminder that long-term hardware usability often survives only because someone is curious enough to poke at it with a hex editor instead of letting it die in a landfill.