Matt Godbolt Explains "Young Man, It's Robots All The Way Down!"
See Robot Languages - Another Part. Also see Matt Godbolt on Robot Semantic Models of CPUs and the 6502 emulator written in 6502 machine code in Stephen Edwards and Bill Mensch on the History of the 6502 Microprocessor.
Soon Computerphile will be able to interview Davide Sangiorgi and get him to explain how he figured out that business about early and late bisimulation without being driven insane in the process.
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Here's Ben Eater showing this on his breadboard 6502 computer
And how the 6522 VIA works as an interrupt controller:
That chip is fairly smart. You could use it to implement a page switching software interrupt and a kind of supervisor more for the 6502. See Talking to Claude about the 6502 Set Overflow pin.
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