资料来源 : Free On-Line Dictionary of Computing

slap on the side
     
        (Also called a {sidecar}, or abbreviated "SOTS").  A type of
        external expansion hardware marketed by computer manufacturers
        (e.g. {Commodore} for the {Amiga} 500/1000 series and {IBM} for
        the hideous failure called {IBM PCjr}).  Various SOTS boxes
        provided necessities such as memory, hard drive controllers,
        and conventional expansion slots.
     
        [{Jargon File}]