Just to give the 9830 another plug, a quick recap of what it was:
- general-purpose computer with built-in high-level language
- all-in-one package
- easy to use out of the box
- truly functional: it was sold to do, and did do, useful work - it was not
a prototype or proof-of-concept machine.
Yes, it was expensive; no, it did not see much use in the home; so it's
outside the lineage of what we tend to think of as 'home computers', but it
was very much a real, practical, representative indication of what was to come,
years ahead of the others.
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?
A couple of comments on the display of the 9830:
- the 32 character 5*7 dot-matrix LED display had large, very easy to read
characters (1/2 to 3/4") and there were keys for horizontal scrolling
through an 80 character (IIRC) line.
- the printer was fast: it didn't take very long, for example, to get a full
program listing (not like waiting for a teletype to clickety-clack across the
page). It was a dot-matrix thermal printer with (IIRC) a full horizontal row
print-head (printed an entire dot-row at once).