Not 100% retro but I've had a lot of fun doing Tiny Code Christmas[1] the last couple of years on TIC-80 [2] For actual retro system. 68000 assembler on the At

Not 100% retro but I've had a lot of fun doing Tiny Code Christmas[1] the last couple of years on TIC-80 [2] For actual retro system. 68000 assembler on the Atari ST is fun or for a slightly different challenge the Amiga [1] https://tcc.lovebyte.party/ https://tcc.lovebyte.party/ [2] https://tic80.com/ https://tic80.com/