Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!ndcheg!ndmath!nstar!root
From: root@nstar.UUCP (Larry Snyder)
Newsgroups: comp.sys.ibm.pc
Subject: Re: serial port problems... HELP!
Summary: multiple COM ports on a PC
Message-ID: <75@nstar.UUCP>
Date: 16 Aug 89 16:53:35 GMT
References: <30004@beta.lanl.gov>
Distribution: na
Organization: The Northern Star, Notre Dame, IN
Lines: 13

In article <30004@beta.lanl.gov>, pt@beta.lanl.gov (Paul A. Thiessen) writes:
> Hello. Does anyone know how to successfully use 3 COM ports on a PC? I have
> a modem on COM1 (or 2), and a card with two serial ports. I have been unable to

This depends on your software but generally speaking comm port 1 and 3 share 
IRQ 4 while comms 2 and 4 share IRQ 3.

Qmodem for example has an installation where you can select the both the
address and interrupt being used for communications.  

-- 
Larry Snyder                          uucp: iuxax!ndcheg!ndmath!nstar!larry
The Northern STAR XBBS/Usenet Site    219-287-9020 (VHST) - 219-289-3745 (PEP+)