Pci Interrupt Request Routing - VIA Technologies Mini-ITX User Manual

The IRQ (Interrupt ReQuest) is the mechanism for devices to request
services from the microprocessor. The "PCI & LAN" IRQ pins are typically
connected to the PCI bus INT A# ~ INT D# pins as follows:
PCI Slot 1
LAN

PCI Interrupt Request Routing

Order 1
INT B#
INT B#
Order 2 Order 3
INT C# INT D#
2-19
Hardware Setup
Order 4
INT A#