PCI Interrupt Request Routing
The IRQ, abbreviation of interrupt request line and pronounced I-R-Q, are hardware lines over
which devices can send interrupt signals to the microprocessor. The PCI IRQ pins are typically
connected to the PCI bus INT A# ~ INT D# pins as follows:
PCI Slot 1
PCI Slot 2
PCI Slot 3
Order1
Order2
INT A#
INT D#
INT B#
INT C#
INT C#
INT D#
11
Order3
Order4
INT C#
INT B#
INT D#
INT A#
INT A#
INT B#