Chapter 2
2-24
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 “AGP/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
1394 INT
E#
PCI Slot
INT B#
INT C# INT D# INT A#
PCI Interrupt Request Routing
