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From: dmarcher@acsu.buffalo.edu (david m archer)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: COM3/IRQ4
Keywords: IRQ4
Message-ID: <59904@eerie.acsu.Buffalo.EDU>
Date: 15 Feb 91 00:00:41 GMT
References: <6820@rossignol.Princeton.EDU> <992@csource.oz.au>
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In article <992@csource.oz.au> david@csource.oz.au (david nugent) writes:
>> If yes, then what is the use of having COM3 and COM4 ?
>
>Hanging different devices off each port.  You may not be able to use two
>devices (on serial ports with the same IRQ) concurrently, but it sure
>beats switching cables all the time. :-)

But I can't even do this much!
 
I have an internal modem at COM3, and it's mere existance
renders my COM1 as unusable, even if COM3 hasn't been
accessed since power-up.   

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