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Pastimes : Dream Machine ( Build your own PC )
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To: Zeddie88 who wrote (6122)2/9/1999 11:35:00 AM
From: Spots  Read Replies (1) of 14778
 
>>trouble getting 3 ATI video cards to work together

I'm not familiar with that particular motherboard,
but you are likely having IRQ and/or busmastering
conflicts.

An IRQ and a busmaster slot are required for the
direct memory access of these latter day video cards.

Try checking the motherboard manual or makers web site.
Somewhere you should be able to find out which and
how many PCI slots are or can be bus master slots and
how IRQs can be distributed.

My Abit BX6-2 mobo, for instance, shares the AGP IRQ with PCI
slot 1, meaning if I put a PCI video card into PCI slot
1 along with a card in the AGP slot, I would have a conflict.
There's no way to resolve this but move the card.

BTW, PCI slots are numbered starting with 1 at the top (closest
to the AGP slot).

Also, if you have legacy ISA devices there may be an IRQ
conflict if the ISA device is trying to get an IRQ that's
assigned to PCI plug and play in the bios. Since the bios
usually assigns IRQs to PCI devices from the bottom up,
the conflict would appear only when you added enough devices.
Similarly, if you have IRQs reserved for ISA devices in
the bios so there aren't enough for the PCI cards.

PCI was supposed to solve all these problems. Thanks, guys.
Go back up your trees and scratch another interrupt architecture
and bus standard on your stone tablets ...
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