Date   : Sun, 27 Mar 1983 20:21:45 EST (Sun)
From   : Keith Petersen <w8sdz@brl.arpa>
Subject: PMMI 103/212 S-100 modem

It is supposed to be ready for sale to the public in June.  I wil
be getting one in about two weeks to do some Beta testing and to
write some software for PMMI.  I'll let you know how it works when
I get it.  It probably won't support 600 baud any more than a
normal Racal-Vadic modem because it is just that - a cooperative
venture between PMMI and Racal-Vadic, with PMMI designing the entire
S-100 interface and Racal-Vadic building their 103/212 programmable
modem on the board.  It is NOT a piggy-back.  It's a fresh design
from PMMI.  PMMI even wrote some new software for the Microprocessor
that's on the board.

This board has many features, including: dial-tone detect, touch-tone
dialing/rotary dialing, redialing of last number, distant end ringing
detect, voice detection (i.e. got a human instead of another modem,
better hang up), busy detect, etc.  Lots of new and interesting
features.  Oh yes, it's possible to count the rings when deciding
whether to answer a call or not.  This means that call-back operation
IS practical with the new PMMI 300/1200 baud modem (the DC Hayes
Smart modem won't do that).

The board meets the full IEEE S-100 specs, including the ability to
operate correctly with systems using 5 mhz clocks (it may actually
work above this, the specs are not final yet).  It looks like a
normal USART-type serial port to the system, making it easy to
program.  It also has maskable interrupt capability.