Changes
/* Oddities */
* The CLV (Clear Overflow Flag) instruction exist but the SEV (Set Overflow Flag) instruction do not.
* The ROR instruction didn't exist in the very earliest (pre-1977) chips.
* 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, added some extra instructions and removed access to all illegal instructions.
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