Pci Interrupt Request - MSI MS-6395 ATX Manual

Chapter 2

PCI Interrupt Request

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
INTA#-INTD# pins as follows.
PCI Slot1 INT A# INT B# INT C# INT D#
PCI Slot2 INT B# INT C# INT D# INT A#
PCI Slot3 INT C# INT D# INT A# INT B#
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