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Date:	Tue, 9 Mar 2004 18:08:24 PST8
From:	"J. R. Fox" <jr_fox@pacbell.net >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: PCI modem and IRQ

Content Type: text/plain

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waynec@linkline.com wrote:

> As an update to some prior posts, I finally resolved my scsi drive problems;
> when I installed a new scsi cable the problem ended.

Hi Wayne,

When this was going on, I think I said something about not overlooking the cable

or connectors as possible suspects . . . .

> Now I am once again having difficulty with my new ActionTec internal PCI
> modem. Although it didn't work for awhile after I first installed it, in the
> midst of the scsi problems, the modem was reassigned to IRQ 3 and it worked.
> Now, after multiple hardware changes while trying to troubleshoot the scsi
> issue, the modem is once again assigned to IRQ 5 and it is not working. I
> get a "Could not initialize the port" error message when I try to use
> Compuserve's CIM program to fetch email.
>
> Modifying the DEVICE=D:\OS2\BOOT\COM.SYS (2,CC00,5) statement in config.sys
> to vary the port address and IRQ does not help.

I have long used SIO as a replacement for the native COM.SYS. I may well be
wrong
about this, but I thought that SIO had the ability to force the IRQ assignment,
so long as:
those IRQ's were not already in service, there were no BIOS settings conflicts,
and there
was no situation where certain PCI slots could *only* support certain IRQ #s.
My SIO
lines from CONFIG.SYS are shown below.

DEVICE=E:\SIO\SIO.SYS (COM1,3F8,IRQ4) (COM2,2F8,IRQ3)
DEVICE=E:\SIO\VSIO.SYS
REM DEVICE=E:\OS2\BOOT\COM.SYS
REM DEVICE=E:\OS2\MDOS\VCOM.SYS

Note that the standard issue COM.SYS and VCOM.SYS lines are REMmed out.

> I do not know if/how I can affect the assignment of an IRQ on a PCI device.

Failing that, the only way I know to force IRQ assignments is to take the
expansion
cards and play musical slots, until the necessary load order and desired IRQ
assignments
have been reached. There should be some combination that works for what you
have.
If there is some other trick, maybe someone here will know it.

Jordan

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