*BSD News Article 26302


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From: nate@bsd.coe.montana.edu (Nate Williams)
Newsgroups: comp.os.386bsd.questions
Subject: Re: DOS disk + SIO lines
Date: 20 Jan 1994 18:08:04 GMT
Organization: Montana State University - Bozeman MT
Lines: 30
Message-ID: <2hmha4$30h@pdq.coe.montana.edu>
References: <2hkvb0$8c0@larch.cc.swarthmore.edu>
NNTP-Posting-Host: bsd.coe.montana.edu

In article <2hkvb0$8c0@larch.cc.swarthmore.edu>,
Patrick Mills <mills@engin.swarthmore.edu> wrote:

>2.)  How can I access COM 3 and COM 4.  I'd like to be able to access my
>	internal modem.  I currenly have COM 1 and COM 2 setup as SIO lines
>	and they work fine.  I have tried masses of different configurations
>	but nothing seems to work.
>
>			IRQ	PORT
>	COM 1		4	03F8
>	COM 2		3	02F8
>	COM 3		4	03E8
>	COM 4		3	02E8

As far as I'm aware of, you can't share interrupts with the dumb serial
I/O cards that are normally supplied with PC's.  You must get one of the
multiple-serial cards that are prevalent in BBS's in order to have multiple
serial lines on the same IRQ.

I don't think any of the free unices handle shared interrupts on the cheap
cards.


Nate

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