Pci Interrupt Request Lines - HP Vectra VEi7 Technical Reference Manual

IRQ
(Interrupt Vector)
IRQ4 Used by serial port if enabled
IRQ5 Free if not used for parallel port or audio
IRQ6 Floppy Disk Controller
IRQ7 LPT1
IRQ8 RTC
IRQ9 Available for PCI devices, if not used by ISA board or USB port
IRQ10 Available for PCI devices, if not used by ISA board or USB port
IRQ11 Available for PCI devices, if not used by ISA board or USB port
IRQ12 Mouse
IRQ13 Co-processor
IRQ14 IDE Primary channel
IRQ15 IDE Secondary channel. Free if secondary IDE is disabled

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, optimal system performance is reached when
minimizing the sharing of interrupts.
Interrupt Request Description
3 BIOS Overview
BIOS Addresses
41