Source : Free On-Line Dictionary of Computing

raster blaster
     
         (Cambridge) Specialised hardware for
        {bitblt} operations (a {blitter}).  Allegedly inspired by
        "Rasta Blasta", British slang for the sort of portable stereo
        Americans call a "boom box" or "ghetto blaster".
     
        [{Jargon File}]
     
        (1995-03-22)