HP11284 (or HP11285) datacomms interface
ard at p850ug1.demon.co.uk
Fri Jan 12 16:53:22 CST 2007
Another of the interfaces I purchased is called an HP11284 data
communications interface, it's part of the 11285 datacomms option (which
also included firmware ROM modules for the HP9830).
Anyway, this thing is complicated. It's 2 modules that plug into the 9830
I/O slots, each contains a PCB. One is stuffed with TTL and RS232 buffers
(1488s and 1489s), the other has more TTL and 4 custom ICs. 2 20 pin ones
(no idea) and 2 40 pin ones (maybe transmitter and receiver logic).
The modules are linked by a cable, there's another cable from the first
PCB I mentioned to the podem (or whatever). It ends in a 36 pin
microribbon connector, I believe there was another cable which I don't
have that connected to that and which ended in a pair of DB25 plugs, one
for the RS232 signals to the modem, ther other carrying RS336 signals to
My first question is simple. Does anyone have this interface with that
last cable and could 'buzz out' the connections so that I can make said
cable, and/or figure out a little of the internal hardware?
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