Ben Eater's Bizarre IBM PS/2 Keyboard Interface Hardware
See my comment on YouTube
I can't help thinking you're trying to tell us something, ... Is there a chip in the IBM PS/2 that works like this? I imagined it would all be handled as a serial interface using some sort of UART/SIO-type device with a buffer implemented in sofware ...
There's also a useful discussion under Eric Broeders' comment:
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