[Damian Peckett] has implemented an Apple ][, its 6502 processor, and a cassette port, all on an Arduino ... The 16u2 is normally used as the Arduino Uno’s USB interface. The only external ...

The board itself also has some differences from the original Arduino Uno. First of all, it has a USB type-C port, which is definitely a bonus. Secondly, it’s simpler: No USB-UART (which also ...