Commodore used two different chips as the Commodore 64 CPU during its long lifetime. Both Commodore 64 CPUs were proprietary derivatives of the venerable MOS 6502, but unlike the 6502, Commodore and its MOS subsidiary never licensed either of them to other sources.
Like the Atari 2600 CPU, the 6510 and 8500 were 6502s with some changes. Unlike the 6507, the 6510/8500 added capability, rather than removing it.









