Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!caen!umich!vela!srodawa
From: srodawa@vela.acs.oakland.edu (Dr. Srodawa)
Newsgroups: comp.unix.xenix.sco
Subject: Re: Using COM3 under SCO XENIX
Message-ID: <3120@vela.acs.oakland.edu>
Date: 25 Sep 90 02:05:04 GMT
References: <402@tygra.UUCP> <1947@sixhub.UUCP> <2078@van-bc.wimsey.bc.ca> <1990Sep24.191042.724@d.cs.okstate.edu>
Reply-To: srodawa@vela.acs.oakland.edu (Dr. Srodawa)
Organization: Oakland University, Rochester MI
Lines: 22

In article <1990Sep24.191042.724@d.cs.okstate.edu> klarich@d.cs.okstate.edu (KLARICH TERRY JAME) writes:
>
>
>I am currently using 4 ports under xenix 2.3.2.  Everything works as it
>should.  However, the catch is that you must use an irq line for each port.
>My ports are using 2, 3, 4 and 5.  I have an article which says the CORRECT
>procedure to make this work.  I don't remember who wrote it.
>
No one has mentioned the obvious solution.  Use an n-way card.  These
generally are designed to use only one IRQ and have only a single interrupt
status register.  I have a generic 4-way card purchased from a large west
coast mailorder house.  The card wasn't very expensive, and it can be
configured either as 4 Ms_DOS type devices, or as a Xenix device.  By
Xenix, they mean what I just decscribed.  The card works with the standard
Xenix asynch driver without a hitch.  I wouldn't even consider playing around
with 4 ports in the MS-DOS way of doing things.  Ron.

-- 
| Ronald J. Srodawa               | Internet: srodawa@unix.secs.oakland.edu |
| School of Engineering and CS    | UUCP:     srodawa@egrunix.UUCP          |
| Oakland University              | Voice:    (313) 370-2247                |
| Rochester, Michigan  48309-4401 |                                         |