It is my understanding that many (most? all?) PCI motherboards share 
IRQs between slots and also even with on-board devices such as COM ports 
and USB controllers.

Some cards share IRQs better than others. I had to do a lot of juggling 
of SCSI card (LSILogic chip), NIC and sound card before I found an 
arrangement that worked.

And I have still neveer been able to use the second channel on that SCSI 
card in OS/2 / eCS. LSILogic told me that it's a motherboard BIOS 
problem that Asus/Award wasn't interested in fixing.

-=-
Alan


On 08/03/05 09:41 am Daniel Lee Kruse tossed the following ingredients 
into the ever-growing pot of cybersoup:

> Testcase:
> Moved SCSI card from edge PCI slot to second PCI slot from AGP slot.
> Seagate 73GB U320 Hard drive is only item attached.
> Disabled all ATA/IDE settings in the BIOS.
> 
> How sensitive are SCSI adapter cards to what PCI slots than are placed
> in?  I moved it from the PCI slot at the edge of the board to the
> second PCI slot from the AGP slot.
> 
> If it's not that, then the ATA stuff was interfering (which I've
> disabled via the BIOS) with the SCSI card as XPee booted the two times
> I've tried it.  Under eCS, LSIMPT.ADD is still reporting no devices
> are attached.
> 
> Is it possible the motherboard's BIOS is at issue?  I haven't had the
> time to bring it up-to-date yet.  That's for my to-do list after work.
> 
> I can also try the other channel on the adapter, too.  Maybe channel A
> is at fault?
> 
> Yes, I'm still fishing for ideas.


 
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