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PCI Interrupt Request Routing
The IRQ, acronym of interrupt request line and pronounced I-R-Q, are hard-
ware 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
Order 1
Order 2
INT A#
INT B#
INT B#
INT C#
INT C#
INT D#
Hardware Setup
Order 3
Order 4
INT C#
INT D#
INT D#
INT A#
INT A#
INT B#
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