Josh Dersch wrote about the HP Integral:
It also would have been nice if they'd put a bit
more in the
system ROM. As it is, there's absolutely no software or tools aside
from the very basic OS on startup. The machine doesn't even know how to
format disks without the Utilities floppy! A simple text editor and
other basic desktop apps (clock, calendar, calculator, terminal,
etc...), or maybe a just a small unix shell and utilities built-in would
have made this machine a lot more useful.
Sounds like you want the "software engineering ROM", though I'm not
certain since I don't have one. I'd really like to get one and dump
the ROM; then it should be easy to make a clone of it. As I understand
it, it's just an expansion board full of ROMs. I don't know how many
ROMs or of what capacity each, but these days it would all fit in a
single flash chip.