Pci Interrupt Request Routing - MSI MS-6577 Getting Started

Chapter 2

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 H# pins as follows:
Order 1
PCI Slot 1 INT F#
PCI Slot 2 INT G#
PCI Slot 3 INT D#
LAN Controller INT H#
AGP Slot INT A#
1394 Controller INT H#
Order 2 Order 3
INT G# INT H#
INT H# INT E#
INT A# INT B#
INT E#
INT B#
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Order 4
INT E#
INT F#
INT C#