MS-6575 M-ATX Mainboard
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
2-28
Order 1
Order 2
INT B#
INT C#
INT C#
INT D#
INT D#
INT A#
Order 3
Order 4
INT D#
INT A#
INT A#
INT B#
INT B#
INT C#