I'm not that familiar with the market situation of
the IBM 5100, but I'd
hazard a guess there were more HP 9830s produced and sold (and actually used)
than IBM 5100s. Did the 5100 have a market niche at all?
They could be used to talk to IBM midrange and mainframe systems at
the time. I do not think there were any other ways to do that on a
portable machine of any kind.
My 5100 system did the books at a movie theatre in Chicago.
--
Will