A-3
Pinnacle Systems TARGA 3000
IRQ Problems
IRQ (Interrupt ReQuest) conflict
— The most common problem encountered when you install PC hardware of any type is the
limited number of Interrupt ReQuests (IRQs) available to expansion cards. Most
expansion cards require at least one IRQ, and sometimes more. If you have an IRQ
conflict, you can resolve it by telling the conflicting device to use a different IRQ.
Consult your Windows Help or manual on hardware conflicts.
Note: Use IRQs of 9 or higher that are not in use by other devices.
You notice that the Windows NT Diagnostics says that another card is sharing an
IRQ with the SCSI controller
— It is true that Windows NT can handle shared IRQs, but if the proceeding scenario is
the case, expect your data rate to be halved. Remove any peripheral cards except for
your VGA card, your SCSI controller card and your TARGA 3000. If this solves the
speed issue then you can add back your other cards being careful to “manually”
assign ISA IRQ’s to the appropriate cards, while leaving as many IRQ's available to
peripherals on the PCI bus.
You tried to provide the TARGA card and the SCSI controller a non-shared IRQ but
it always ends up shared. Your BIOS does not allow you to assign IRQ's
— Try reordering the cards in your PCI slots. Try to give the TARGA card the
first/primary PCI slot. This should ensure that the TARGA gets a clean non-shared
IRQ. The next slot should be the SCSI controller followed by your VGA card. This
will give you the ideal slot priority.
Note: Systems with AGP slot mother boards usually share resources with the first and last PCI slots.
Manufacturers may force sharing on other slots as well.
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