MSI ATX Mainboard MS-6775 (v1.x) manual PCI Interrupt Request Routing

MS-6775 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:

	Order 1	Order 2	Order 3	Order 4
PCI Slot 1	INT A#	INT B#	INT C#	INT D#
PCI Slot 2	INT B#	INT C#	INT D#	INT A#
PCI Slot 3	INT D#	INT A#	INT B#	INT C#
PCI Slot 4	INT C#	INT D#	INT A#	INT B#
PCI Slot 5	INT B#	INT C#	INT D#	INT A#

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