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4 HP BIOS
BIOS Addresses
Interrupt Controllers
The Interrupt Requests (IRQ) are numbered sequentially, starting with the
master controller, and followed by the slave.
PCI Interrupt Request Lines
PCI devices generate interrupt requests using up to four PCI interrupt
request lines (INTA#, INTB#, INTC#, and INTD#).
PCI interrupts can be shared; several devices can use the same interrupt.
However, optional system performance is reached when minimizing the
sharing of interrupts. Refer to pages 27
and 28 for the Desktop and Mini-
tower Backplane PCI Mapping tables, and page 39
for a table of the PCI
device interrupts.
IRQ
(Interrupt Vector)
Interrupt Request Description
INTR
IRQ1 NS317 Keyboard Controller
IRQ0 PIIX4 System Timer
IRQ3
IRQ4 NS317 COM1, COM3
IRQ5 AD1816, LPT2
IRQ6 NS317 Flexible Disk Controller
IRQ7 NS317 LPT1
IRQ8 NS317 RTC
IRQ9
IRQ10
IRQ11
IRQ12 NS317 Mouse
not connected
IRQ14 PIIX4 IDE
IRQ15