Alan Beagley wrote:
 
> 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.

Not all motherboards make all slots share with other slots, but in most
cases each of several or even all slots share with onboard devices. On a
lot of boards slot 2 and/or 3 will get a unique IRQ.
 
> 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.

Sharing tends to be considerably less problematic with modern OS kernels
that aren't limited to 15 hardware interrupts. Doze and Linux routinely
use interrupt numbers in the high teens and in the 20's.
 
> 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.

This problem dates back many years, having extensive discussion in
news:comp.os.os2.*
-- 
"Who of you by worrying can add a single hour to his life?"
                                                Matthew 6:27 NIV

 Team OS/2 ** Reg. Linux User #211409

Felix Miata  ***  http://members.ij.net/mrmazda/



 
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