Source : Free On-Line Dictionary of Computing

palmtop
     
         (Or "pocket computer", "Hand-held Personal
        Computer", H/PC) A small general-purpose, programmable,
        battery-powered computer cabable of handling both numbers and
        text (in contrast to most {pocket calculators}) which can be
        operated comfortably while held in one hand.  A palmtop is
        usually loaded with an {operating system} such as {Windows
        CE}.  Data can be transferred between the palmtop and a
        desktop {PC}.
     
        A palmtop is very similar to a {Personal Digital Assistant}
        though a palmptop may have a larger keyboard and more {RAM}
        and is possibly more general purpose in concept, if not in
        practise.
     
        The {Psion Organiser} is one of the best known examples.  [Was
        it the first?]
     
        (1998-04-19)