The parallel cable for the keyboard reminded me of a hack I did back in the day, stripping wires from two SNES controllers and connecting them to a DB25 connector to plug into the parallel port of my PC running MAME. The cool thing with the parallel port is that you can control most of the pins individually, so it was pretty trivial to write a driver to send/receive the control messages the SNES controllers expected.
Sadly this kind of thing is not possible anymore on modern consoles, due to the highly locked-down protocols they use.
Another Decathalon survivor here.
[dead]
A fun story, but what really grabbed me was the story he linked to about the author's father, the engineer: https://lostincyberspace.substack.com/p/son-of-a-son-of-a