(C64) An 8-bit Commodore Business Machinespersonal computer released around September 1981. Prototypes were (apparently) made before Christmas 1980 (and shown at some computer fair).The CPU was a 6510 from MOS Technologies (who were a wholly owned subsiduary of Commodore at this time(?)).The C64 had 64 kilobytes of RAM as standard and a 40-column text, 320x200 pixel display generating composite video, usually connected to a television.DMA-based memory expanders for the C64 (and C128) allowed 128, 256, and 512 kb of RAM.Several third party manufacturers produce accelerators and RAM expanders for the C64 and C128.(Some, risking a holy war, compare this to putting a brick on roller-skates).Such accelerators come in speeds up to 20MHz (20 times the original) and RAM expanders to 16MB.The C64' s 1541 5.25 floppy disk drive had a 6502 processor as a disk controller.See also Commodore 65.["Assembly language programming with the Commodore 64", Marvin L. De Jong].(1996-06-05)