User`s manual

Hardware Setup
2-19
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 Interrupt Request Routing
Order 1 Order 2 Order 3 Order 4
PCI Slot 1 INT B# INT C# INT D# INT A#
LAN INT B#