* The NOP instruction takes 2 full-cycles. This is the minimum amount of cycles an instruction can take.
* The 65C02 fixed multiple bugs of the original NMOS 6502, but also added some extra instructions and removed access to all illegal instructions.
* There are multiple implementations of the 65C02 (WDC 65C02, WDC 65C02S, Rockwell R65C02, CSG 65CE02), each with its own variant of the instruction set.