Na ja, wikipedia: The C64 used an 8-bit MOS Technology 6510 microprocessor. This was a close derivative of the 6502, with an added 6-bit internal I/O port that in the C64 is used for two purposes: to bank-switch the machine's ROM in and out of the processor's address space, and to operate the datasette tape recorder.
Szóval lényegében mindegy hogy 6502 vagy 6510, bár nem írják itt hogy mi a "close derivative".