Service Manual/Schematics for an IBM 7861-015 modem?

[Ethan Dicks]

On 2/11/07, Dave McGuire <mcguire at neurotica.com> wrote:
> On Feb 11, 2007, at 2:18 PM, Ethan Dicks wrote:
> > Had a good day at the Mansfield Hamfest today.  I now have some LCD
> > monitors that I need to scope out power for (+5 @ 2A, +12 @ 1A), a
> > nixie-tube panel DVM, and a couple of IBM modem frontpanels.

>    Oh now that's a damn good idea.  Those modems are all over the
> place.  I think I will have to grab a couple of those myself! :)

Well... for $1 each for 3, if I throw everything away but the keypad,
I still did OK.

With no technical info within a few google searches, I started
dismantling one.  It seems that under the keypad is some
mask-programmed 40-pin DIP Texas Instruments microcontroller.  :-(  I
may just remove the VFD and figure out how to multiplex and drive it
the hard way from some modern microcontroller.  1x16 is handy for
plenty of things.

If anyone does ever turn up anything detailed on these, I would still
appreciate hearing about it.

Thanks,

-ethan