*BSD News Article 2049


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Newsgroups: comp.unix.bsd
Path: sserve!manuel!munnari.oz.au!uunet!cs.utexas.edu!natinst.com!bigtex!james
From: james@bigtex.cactus.org (James Van Artsdalen)
Subject: Using IRQ 2 & VGA
Message-ID: <1992Jul19.114000.28123@bigtex.cactus.org>
Keywords: 386bsd ne2000
Reply-To: james@bigtex.cactus.org (James Van Artsdalen)
Organization: Institute of Applied Cosmology, Austin TX
References: <greg.711512526@hibp1.ecse.rpi.edu>
Date: Sun, 19 Jul 1992 11:40:00 GMT
Lines: 18

In <greg.711512526@hibp1.ecse.rpi.edu>, greg@ecse.rpi.edu (Greg) wrote:

> When I first installed 386bsd 0.1, my ne2000 card would not transmit.
> It also sporadically gave error: isr 15 and error: isr 17 messages.

> I suspected a problem with the interupts. My ne2000 was jumpered for 
> irq 2 and ioadx 0x300 as per the install notes. The only other boards in
> the machine are the vga and the FD/HD serial/par do-it-all card.

Some VGA cards use IRQ 2 for a vertical retrace interrupt.  Even when
the interrupt is not enabled in the VGA, some cards drive IRQ 2
inactive instead of leaving the signal tristate.

If this is the problem, you can use Scotch tape to cover the IRQ 2
signal on the VGA's ISA connector.
-- 
James R. Van Artsdalen          james@bigtex.cactus.org   "Live Free or Die"
Dell Computer Co    9505 Arboretum Blvd Austin TX 78759         512-338-8789