6502 and its variants were used in many platforms, particularly video game systems and TV computers like the Apple II family, BBC Micro, Commodore Pet/VIC-20/64

6502 and its variants were used in many platforms, particularly video game systems and TV computers like the Apple II family, BBC Micro, Commodore Pet/VIC-20/64, Atari 400/800, Nintendo Entertainment System/Famicom, and TurboGrafx-16/PC-Engine. Introductory information about it tends to be oriented toward those platforms rather than the chip itself. https://skilldrick.github.io/easy6502/ https://skilldrick.github.io/easy6502/ might be a good starting point if you're already familiar with assembly language in general (it's styled as an assembly language tutorial, but I'm not really in a position to know how good it is at that).