Another fun way to learn is to run games and demo's in WinVICE, accompanied by the ICU64 visualiser ( http://icu64.blogspot.com/ ). It allows you to narrow down where in memory code is running and what it is doing, in a fun, visual way. I taught myself C64 programming by examining other people's code and figuring it out (and sometimes copying it, too). It's a lot easier to do this with ICU64.