This was developed and tested with an original Amiga 500 keyboard and an Arduino Leonardo board. Other combinations are not tested, other boards based on the ATmega32U4 microcontroller should work ...

Do you just want to go really old-school and play around with radio teletype, slow-scan TV, or even Hellschreiber using nothing but a cheap radio module ... AVR - Arduino Uno, Mega, Leonardo, Pro Mini ...