As I come from a time before the internet, I first began coding on early 8-bit home micros from the 1980's. When I'm not developing audio plug-ins I have a side-project coding (and playing) some retro games in my own particular idiom here - https://www.acmtretro.co.uk/games/index.html (I made these back in 2020, because I had some, spare time...)
they run on original 48K ZX Spectrum hardware (the ZX machines were a big deal here in the UK back then), emulators, or as standalone games for Windows / Linux using the built-in emulation engine (complete with CRT simulation for extra retro goodness)