While it’s not at all complicated from a build standpoint, the key to this project is that it’s a great example of using ... for emulating a USB keyboard with an Arduino Uno or Mega.

[Damian Peckett] has implemented an Apple ][, its 6502 processor, and a cassette port, all on an Arduino Uno. If that wasn’t enough, he also uses a PS/2 keyboard ... of the emulation and other ...