[cybrox]

I once designed a custom PCB that fits inside the original NES four score case. You can connect 4 NES controllers to it and the inputs were sent to a Raspberry Pi via UDP (so no wire between couch table and TV was needed).

I think my PCB had more parts for its simple power supply than all 4 NES controllers combined.

These things are an absolute masterpiece of simplicity!

[toasteros]

My coworker has done a similar thing, designing a PCB that allows us to connect the SNES controller over RJ45 to a custom Pi hat. We have students writing bare metal code for it!