My first computer was a ZX81, then an QL. I still have them at home. Maybe I'll try to power them up. I've found some listings of programs I wrote in BASIC on the ZX81. They are only marginally easier to understand than machine code, maybe not :-) but they were the first step to bring me here. Thanks Sir Sinclair.
Don't plug them in without doing some basic checks! A common fault with the ZX81 at least is the PSU and/or the internal voltage regulator degrades/fails and will destroy the RAM chips. Have a look through some of Noel Retro Lab videos for some tips first: https://www.youtube.com/c/NoelsRetroLab/videos
