Date   : Sat, 26 May 1984 22:14:06-PDT (Sat)
From   : hplabs!sdcrdcf!sdcsvax!sdccsu3!loral!simard@Ucb-Vax.ARPA
Subject: US Robotics modem compatibility question

       I'm thinking of getting a US Robotics modem (don't have a 
model # yet, but it's the S-100 bus, 300/1200 baud 
answer/originate type).  It's going into an ancient Altair, with
an 8080 CPU, which uses certain bus signals differently from Z-80's,
particularly MEMR and SOUT, and I am not sure it is compatible with
the original S-100 bus with an 8080.

       Does anyone have any experience with this product in this
environment?  It is supposed to be IEEE-compatible, but I don't hav
a copy of the IEEE spec to compare to my bus (I have heard there are
some differences) and US Robotics does not make schematics available,
which makes modifying the unit difficult. 

       Any help would be greatly appreciated.

Ray Simard
Loral Instrumentation, San Diego, CA.