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The 6510 is a microprocessor designed by MOS Technologies, and is a successor to the 6502. The primary changes were the addition of clock pins, which allowed the chip to use external clocks, and the addition of I/O ports which allowed the CPU to handle simple tasks without needing the 6522 VIA.
The 6510 was only widely used in the Commodore 64 home computer. In this machine, the extra pins on the processor were used for switching in and out memory banks, and for controlling the electric motor of the cassette recorder.