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From: mikek@col.hp.com (Mike Karin)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: MODEM BLUES
Message-ID: <25580002@col.hp.com>
Date: 13 Sep 90 16:15:35 GMT
References: <1990Sep12.163318.2321@rosewall.citib>
Organization: HP Colorado Springs Division
Lines: 24

Interesting!

I had a similar problem with an IBM PC/XT.  In this case, any combination
of two boards that had serial ports on them would result in the system
not recognizing any of the serial ports properly.  With only one board
installed (even the HP board that had two serial ports), things worked
fine.

The boards that I was trying were : (1  Zoom Telephonics Modem
                                    (2  HP serial board w/ 2 serial ports
                                    (3  DTK board w/ one printer port
                                        and one serial port

All boards were configured according to the documentation that came with
them and I was very careful to not have any conflicting addresses or 
interrupt levels.

I needed to leave the modem in the machine so that's what is in the
machine now.  I never did figure it out.

Mike Karin
Hewlett-Packard Co.
Colorado Springs Division
mikek@col.hp.com