Dug up an HP 9831A...single-line, dot matrix display, full keyboard desktop unit (abt the size of a typewriter). Looks fairly old. Seems to be a full computer (not a programmable calculator, which they also made a lot of), as it wakes up in a BASIC mode. I get a lot of error messages --probably due to improper commands. It will accept and run a simple program. Anyone want it? manney(a)nwohio.com