Subject: Hewlett Packard 9810A calculator

From: [email-masked] (Brian Murray)
Date: Mon, 18 Oct 1993 07:14:11 GMT

I have an HP 9810A calculator (1971 vintage, about the size of
a large VCR, full of gold-plated PCB's, 3 line by 15 digit LED
display, thermal printer, magnetic program card reader/writer,
has plug-in rom cartridges, etc.) which almost works,
but not quite. I get the display to light up and it sort-of
responds to keypresses, but every numeral you type produces
a '0' digit on the display. Typing 3 digits for example
produces '000' on the display. Does anyone know anything about
this beast? Does anyone have any schematics for it? Anyone
know any tricky things about it (assuming I get it to
work again)? The pinout of the peripheral bus (it has 3
peripheral slots, as well as 3 cartridge slots)?
It came with 3 cartridges : Mathematics, Peripheral II,
and Printer Alpha. Anyone have any manuals that I might
be able to copy? Anyone even heard of it?

Thanks in advance ....
-- 
------------------------------------------------ Brian Murray ---
[email-masked]  CBX250  Apple//c  VAX 11/750  SGI Indigo
-----------------------------------------------------------------