Specifications

2-16 Chapter 2: Hardware information
2.5.3 Interrupt assignments
IRQ Priority Standard Function
0 1 System Timer
1 2 Keyboard Controller
2 — Re-direct to IRQ#9
3* 11 Communications Port (COM2)
4* 12 Communications Port (COM1)
5* 13 IRQ holder for PCI steering
6 14 Floppy Disk Controller
7* 15 Printer Port (LPT1)
8 3 System CMOS/Real Time Clock
9* 4 IRQ holder for PCI steering
10* 5 IRQ holder for PCI steering
11* 6 IRQ holder for PCI steering
12* 7 PS/2 Compatible Mouse Port
13 8 Numeric Data Processor
14 9 Primary IDE Channel
15 10 Secondary IDE Channel
* These IRQs are usually available for ISA or PCI devices.
Description INTA INTB INTC INTD RE Q# GNT#
PCI Slot 1 PIRQE# PIRQF# PIRQG# PIRQH# REQ0 GNT0
PCI Slot 2 PIRQG# PIRQH# PIRQE# PIRQF# REQ0 GNT0
PCI Express Slot (x8) PIRQB# — — — —
PCI Express Slot (x8) PIRQB# — — — —
Onboard USB Controller1 PIRQB# — — — —
Onboard USB Controller2 PIRQA# — — — —
Onboard USB2.0 Controller PIRQB# — — — —
Onboard PCI E X1 LAN1 INTA# — — — — —
Onboard PCI E X1 LAN2 — INTB# — — — —
Onboard VGA — — — — — —
Standard interrupt assignments
PCI Bus Number, IDSEL, and IRQ assignments