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@thomasfuchs since so many people are saying it, no, this is 100% not for a rom.

roms are 0.6 wide not 0.3, and need data+address+control lines. Even a 256 byte chip needs 20 pins.

Both keyboard and joystick are 0.3 wide 16 pin DIP sockets.
The keyboard is a one byte input port on the databus so can't have two and a select switch.
Joystick was internal connector only, so an extension is the only way to swap joysticks without opening the lid.