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 for Commodore 64
From The Free On-line Dictionary of Computing (30 December 2018) :

  Commodore 64
      (C64) An 8-bit Commodore Business Machines
     personal 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 Technology (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].

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