Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!samsung!umich!sharkey!tygra!cat
From: cat@tygra.UUCP (CAT-TALK Maint. Account)
Newsgroups: comp.unix.xenix.sco
Subject: Installing N516550AN's on a DIGIBOARD PC/4
Message-ID: <394@tygra.UUCP>
Date: 12 Sep 90 23:36:58 GMT
Organization: CAT-TALK Conferencing Network, Detroit, MI
Lines: 17

System: SCO Xenix 2.3.2, 386 20MHz machine
        Digiboard PC/4
        4 USR Courier HST modems. DCE-DTE speed locked at 9600 baud.

Problem: Garbage characters get inserted into the data stream, serial
         port or modem wont reset after a call (SD,RD lites on the modem
         stay on constantly and the TR light goes out.)

I was told that the I/O chips on the PC/4 are "dumb" and have problems
handling high speed calls. In this case every call is high speed as the
DTE-DCE rate is locked at 9600 baud. Someone suggested replacing the chips
on the PC/4 with N516550AN's. Is this chip plug-compatible with whats on
that board?? Thanks in advance for your help.

jpp@ddmi.com