HP A7818-IE002 - Manual (Page 62)

System Board
Assigned Device Interrupts
Chapter 2 62
PCI IRQ Lines
PCI devices generate IRQs using up to four PCI IRQ 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.
Refer to page 60 for a table of the PCI device interrupts.