Number Invaders on a GRAF NDR Klein-Computer

After I wrote a kind of Number Invaders for the Sharp PC-E220 in BASIC ( https://www.youtube.com/watch?v=eRqRXSJgNzQ ), I could not resist and developed it also for the GRAF NDR Klein-Computer but this time in Z80 Assembler.

Hardware: SBC3 board on a HEXIO2 interface.

If you are interested in a new retro calculator with the original game on it or want to know how it works then feel free to visit Techmoan’s video: https://youtu.be/UIZgzbtg5j8 ... https://www.youtube.com/watch?v=aEAPqWKQ7-Q