Source : Free On-Line Dictionary of Computing

blitter
     
         /blit'r/ (Or "{raster blaster}").  A
        special-purpose {integrated circuit} or hardware system built
        to perform {blit} (or "{bit bang}") operations, especially
        used for fast implementation of {bit-mapped} graphics.
     
        The {Commodore} {Amiga} and a few other {microcomputers} have
        these, but in 1991 the trend is away from them (however, see
        {cycle of reincarnation}).
     
        [{Jargon File}]
     
        (1996-04-30)