6 Sep
2005
6 Sep
'05
2:51 a.m.
At 10:18 PM 9/5/05 +0100, you wrote:
I recently won an HP82915 Modem on E-bay (my first, and
so far, only
purchase there).
Tony? E-bay?? Now I know the end of the world is coming! :-)
I was suprised to get it for the opening bid, I though
I'd have at least one other HP collector to contend
with. It is, you see,
the internal modem for the HP Integral.
Darn you! I keep a constant watch on E-bay for Integral stuff but I
didn't see it!
Anyway, it's a single PCB that fits into one of the Integral's expansion
slots. Cotnains about 20 ICs, most of which I recognise. One odd thing is
that the serial chip used is an 8250, a somewhat odd choice for a
68000-based machine.
Does anyone here know anything about using it?
Not much. It's a 300/1200 Baud modem. ONE sales brochure list it in ONE
place but give NO details or pictures and never mentions it again. The
service manuals don't give ANY details about it. (It's one of those "If it
fails, replace the CCA. If it still fails, replace the whole thing."
procedures.) To test it they have you install two modems in the IPC and
plug them into separate phone lines and call one from the other while
running the diagnostics program. The diagnostics program will report No
Carrier, No Dialtone and the like but that's all. There no mention of a
null-modem type cable.
Joe
The Integral manuals I
have mention it exists, say it installs like any other
board, and that
you need a normal 'modular phone cable' to link it to the phone line.
Nothing I'd not worked out by myself.
Incidentally, I have no intention of linking it to a public phone line,
I just want to connect it to another modem. I suspect it'll work withont
any DC voltage on the line, if not, that's easy to fix.
Did anyone, though, have a cheap/homebrew device to link 2 modems
back-to-back, doing things properly with dial and ring tones, etc?
-tony