The firmware for the frontpanel key controller is pretty simple: It scans two rows called A and B by setting the respective output high for a while, reads what comes in on a 8-bit input, and sends changes from a remembered previous run to the serial bus. If there were changes, some wait cycles are run to prevent false signals from bouncing keys. I was lacking capacitors of the right value, sorry.
Files for the 80C535 controller used here:
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