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From: david@metapyr.UUCP (David Relson)
Newsgroups: comp.os.os2.misc
Subject: Re: modem card and OS/2 ?
Message-ID: <128@metapyr.UUCP>
Date: 27 Nov 90 22:17:33 GMT
References: <5691@tuminfo1.lan.informatik.tu-muenchen.dbp.de> <BiF8s3w163w@ersys.uucp>
Reply-To: david@metapyr.UUCP (David Relson)
Organization: Meta/LBMS -- Ann Arbor, MI
Lines: 15

COM01.SYS only supports devices COM1 and COM2 (at IBM's standard addresses).
I have seen mention of patches to change the device names and their addresses
to allow use of additional devices.  I don't know if these work.

At one point I modified COM01.SYS to suppor three devices (COM1, COM2, and 
COM3) at addresses (3F8, 2E8, 3E8 (if I remember correctly)) and interrupts
(4,3, and 5).  It worked fine until I tried to use ZMODEM, when I started
to get frequent, intermittent errors.  When I changed my modem to COM2/2E8/3
and switched back to standard COM01.SYS, all worked fine.

Note:  the other change in environment was OS2 syslevel - my modification
was based on syslevel 4020 and I'm now using syslevel 4069.  Someday I'll
try the original COM01.SYS with ZMODEM and see what happens.  Until then
it's two serial ports at standard addresses.