I don't agree to the last post that hardware was meant to share..
It depends on a lot of different things. Is the motherboard fully ACPI compatible? Does the pci card fully comply with the standards? Bios good?
If not you're in for a world of pain.
You can always re-install and use the F5 key to selected "Standard c-stepping 486 PC" which will disable ACPI alltogether and you'll be able to shift irq placements.
Another thing that can do the trick is to force windows 2000 back to the standard c-stepping pc mode. It's quicker than re-installing.
You might have noticed that if you go to your BIOS and disable ACPI your computer will not boot. Leave it on and boot into win2k.
Right click "My computer"-> Properties -> Hardware -> Device manager
-> Expand "Computer" -> Right click "ACPI PC" -> Properties -> Driver
-> Update driver - > Next - > "Display known driver list" -> Check "Show all hardware of this device class" -> choose "Standard PC" -> Next....
Win2k will probably warn you that this might not be the correct driver but indeed it is.
Restart your computer and go to BIOS to disable ACPI.
Boot back into win2k and it will "discover" most of your hardware all over but when it's done you'll be without ACPI.
Go back into the device manager and bring up the properties for "standard PC". Under "IRQ steering" you might also want to uncheck "use irq steering" and reboot again.
Now you'll find that your Pci cards are most likely placed on different IRQ's but if you still have a problem with one or two cards you should change their physical location in the computer until they're on seperate IRQ's.
Hope it helps.
P1