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Available IRQs
IRQs 5 and 10 are available for assignment. If a non-Plug And Play compliant ISA card is
installed, set it to use either IRQ 5 or IRQ 10. In BIOS Setup, the selected IRQ must be set to
reserved.
Freeing IRQs
To free IRQs for use by an ISA device or a PCI device that uses drivers that do not comply with
the PCI 2.l specification, you can use the system BIOS to disable unused system ports.
To disable an unused system port:
1.
Restart the system and press
2.
Select Setup, and then select Peripheral Setup.
3.
Select the port you want to disable (OnBoard Serial Port 1, OnBoard Serial Port 2, or
OnBoard Parallel Port).
4.
Change the value of the setting to Disabled.
5.
Save the changes and exit from BIOS Setup.
PCI Devices
The system's PCI expansion slots comply with the PCI 2.1 specification. Devices that comply
with the PCI 2.1 specification are fully plug-and-play. You do not have to configure them after
installation.
Some older PCI device drivers cannot share an interrupt, which is a violation of the PCI 2.1
specification. If you install a device that uses such a driver, you must free an IRQ for the device to
work in the system.
PCI to ISA Bus Interrupt Mapping
The system's ISA bridge provides the sixteen conventional ISA interrupts, plus four interrupt
request pins for PCI peripheral interrupts (PIRQ0 through PIRQ3). For PC-AT architecture
compatibility reasons, the PCI interrupts are routed to the ISA interrupts within the ISA bridge.
The assertion of a PCI interrupt concludes in an ISA interrupt being asserted.
Bit 7 of each PIRQ registers enable (Low) or disable (High) the routing of the PIRQ to an ISA
interrupt. The lowest four bits (3:0) of each PIRQ register determines to which ISA interrupt the
PIRQ is routed.
when prompted to enter Setup.
DEL
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