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 for VIC-20
From The Free On-line Dictionary of Computing (30 December 2018) :

      A home computer made by Commodore with a 6502
     CPU, similar in style to the Commodore 64 and Commodore
     C16.  The VIC-20 was released before the C64, and after the
     Commodore PET(?).  It was intended to be more of a low-end
     home computer than the PET.
     The VIC-20 had connectors for game cartridges and a tape
     drive (compatible with a C64).  It came with five kilobytes
     of RAM, but 1.5 KB were used by the system for various
     things, like the video display (which had an unusual 22x20
     char/line screen layout), and other dynamic aspects of the
     operating system (such as it was).  The RAM was expandable
     with a plug-in cartridge which used the same expansion port as
     games.  Port expander boxes were available to allow more than
     one cartridge to be connected at a time.
     RAM cartridges were available in several sizes: 3K, 8K, 16K
     and 32K.  The internal memory map was re-organised with the
     addition of each size cartridge, leading to the situation that
     some programs would only work if the right amount of memory
     was available.  The 32K cartridges were all third-party and
     had switches to allow the RAM to be enabled in sections so
     that any expansion size could be achieved.
     BASIC programs could use at most 24 KB of RAM.  Any extra
     occupied the location usually used by ROM cartridges
     (i.e. games).  This allowed people to copy ROM cartridges to
     tape and distribute them to their friends, who could load the
     tape into the top 8k of their 32k RAM packs.
     The name "VIC" came from the Video Interface Chip that was
     also used in the other, later, Commodore 8-bit computers.

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