I learnt to program on a C64 :-). I have one packed away but I think the power supply is dead. We also had a C128 at some point. IIRC the C128 had an 8502 processor plus something like a Z80. I have an Atari 400 and Atari XEGS, plus several old consoles. I'm not sure I'm up for a port to the Atari 400, the membrane keyboard is kind of a pain :-).
Regards,
Jo