Basic level, and middle-complex 6502: Your brief questions I will answer, just PM your 6502 question, mostly on instruction actions. The previous answers help with specific machines, using 6502 IC plus using the 'Signal' type. I think, historically linked to 6800 family type (loosely ?).
But sure, ask any 6502, I am mid-level exp.
(Wrote 'XEVIOUS' C-64, but that was 35 years ago !).
Might take few days for responses, thanks.
Rick