Pci-To-Isa Interrupt Map; Table 4-2 Pci-To-Isa Interrupt Map - Silicon Graphics Zx10 User Manual

4: Resources

PCI-to-ISA Interrupt Map

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1. Start or restart the system and run the BIOS Setup program.
2. Go to the Advanced Screen and select the PCI Configuration parameter.
3. Select and reserve the appropriate IRQ.
4. Save the changes and exit from BIOS Setup.
The system has a limited number of available IRQs. To install more ISA peripheral
devices than you have available IRQs, you must disable one unused system port for each
excess ISA device, unless the device does not require an IRQ.
Some older PCI device driver software cannot share an interrupt, which is a violation of
the current PCI specification. If you install a device that uses such driver software, you
must free an IRQ for the device to work in the system.
PCI peripheral devices installed in the system require one or more PCI interrupt requests
(PIRQ). Four interrupt lines—INTA, INTB, INTC, and INTD—are available for PCI
interrupt requests.
Table 4-2 PCI-to-ISA Interrupt Map
Device PCI Bus/Device
SCSI A Bus 0, Dev 1, Func 0
SCSI B Bus 0, Dev 1, Func 1
Audio Bus 0, Dev 2, Func 0
PCI socket 1 Bus 0, Dev 3
PCI socket 2 Bus 0, Dev 4
PCI socket 3 Bus 0, Dev 5
PCI socket 6 Bus 0, Dev 6
Ethernet Bus 0, Dev 7, Func 0
AGP socket Bus 1, Dev 1
CF8h Value INTA INTB
800008xx PIRQ13
800009xx PIRQ12
800010xx PIRQ14
800018xx PIRQ00 PIRQ01
800020xx PIRQ02 PIRQ03
800028xx PIRQ04 PIRQ05
800030xx PIRQ06 PIRQ07
800038xx PIRQ07
800100xx PIRQ01 PIRQ03
INTC INTD
PIRQ02 PIRQ03
PIRQ00 PIRQ01
PIRQ13 PIRQ12
PIRQ04 PIRQ05
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