NetNews Usenet Archive 1993 #3/NN_1993_3.iso/spool/comp/dcom/modems/19936

Internet Message Format | 1993-01-24 | 1.8 KB

Path: sparky!uunet!europa.asd.contel.com!gatech!psuvax1!psuvm!wvnvm!u4400
Date: Sun, 24 Jan 1993 15:33:27 EST
From: <[e-mail]>
Message-ID: <[e-mail]>
Newsgroups: comp.dcom.modems
Subject: Re: Help needed about comm 3&4 usage
References:  <[e-mail]>
Lines: 28

In article <[e-mail]>,
[e-mail] says:
>
>I recently bought the complete pc communicator fax/voice/modem card for
>my system.  This board is up and running. no problems.  My problem now
>is that I need a 9600 bps modem and my current one is only 2400 bps. I
>want to know if it is possible to install a second modem board in my
>system. Considerations:  I have to use comm 1 or 2 for my current modem,
>no choice. If I install a second one on the other port what happens to
>my mouse which I want to use also. I would only be running one modem
>port at a time but how do you switch between the two and still keep the
>mouse. My thought is to put the mouse on comm 3 or 4 and the modem on
>comm 1 in this case. Can this be done (Two modems at once).  If so how
>and where should comm ports be assigned i.e. mouse=comm1 or mouse=comm3.
>
The problem in using COM3 or COM4 is that they use they same hardware
interrupt (IRQ) as COMS 1 & 2.  SO, if you don't want to run into major
problems, buy an internal 9600 baud modem that allows you to set the
modem to COM3 and an alternate interrupt (the most common alternate is
IRQ5).  That way , COM1 will use IRQ4, COM2 will use IRQ3, and COM3 will
use IRQ5 (this is provided you don't have an LPT2 printer port, which
would use IRQ5).
If you have questions about IRQs (I do modem software problem solving
for a paycheck), just ask.
- Eric
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