[marcodiego]

CHIP-8 is splendid for anyone who wants to implement a simple emulator. Highly recommend it. I did it in one weekend as an exercise.

Also, it is impressive how users/programmers on the home computer era got to great lengths to achieve compatibility and make the most use of the limited hardware available: AFAIK, one of the goals of CHIP-8 was to improve code density and so waste as little memory as possible.

Another invention from the same era also worth taking a look is tiny-basic which I think you can even run on the Arduino and use its serial port with a terminal to get a fully functional basic computer.