MS-6590 ATX Mainboard
PCI Interrupt Request Routing
The IRQ, acronym 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
PCI Slot 4
PCI Slot 5
2-32
Order 1
Order 2
INT A#
INT B#
INT B#
INT C#
INT D#
INT A#
INT C#
INT D#
INT B#
INT C#
Order 3
Order 4
INT C#
INT D#
INT D#
INT A#
INT B#
INT C#
INT A#
INT B#
INT D#
INT A#