*BSD News Article 24998


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Newsgroups: comp.os.386bsd.questions
Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!agate!howland.reston.ans.net!pipex!uunet!scomm!jan
From: jan@filetek.com (Jan Morales)
Subject: [NetBSD 0.9] configuring 4 serial ports
Message-ID: <CI1GEq.382@filetek.com>
Sender: news@filetek.com
Organization: FileTek, Inc., Rockville, Maryland, U.S.A.
Date: Tue, 14 Dec 1993 18:52:01 GMT
Lines: 25

I was having trouble losing characters under heavy load and was told that
part of the problem was that my serial ports were driven by 16450 UARTs
and that I should get a 16550 UART-based serial card and that should help.
I took advantage of the opportunity to buy a 4-port card.

The doc for the card says that the 4 ports can be configured to any IRQ
from 2 to 5.  Does this mean that I should put each port on its own IRQ?
I had read somewhere that normally ports 1 and 3 share an IRQ and ports
2 and 4 do as well.

I'm not at the machine right now but let's assume that currently port 1
is on IRQ2 and port 2 is on IRQ3.  I plan to disable the motherboard
serial ports and configure ports 1 and 2 on the card as they were on the
motherboard.  Do I then configure ports 3 and 4 on the card to IRQs 2
and 3 respectively, or IRQs 4 and 5?

Any help for the clueless is appreciated!  :-)

Vital stats: 486DX33, 16Mb RAM, no SCSI or network

Jan
-- 
Jan Morales                      Internet: jan@filetek.com
FileTek, Inc.                        UUCP: uunet!fltk!jan
Rockville, Maryland, U.S.A.