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2-12
Chapter 2: Hardware information
Standard Interrupt Assignments
IRQ Priority Standard Function
0 1 System Timer
1 2 Keyboard Controller
2 N/A Programmable Interrupt
3* 11 Communications Port (COM2)
4* 12 Communications Port (COM1)
5* 13 Sound Card (sometimes LPT2)
6 14 Floppy Disk Controller
7* 15 Printer Port (LPT1)
8 3 System CMOS/Real Time Clock
9* 4 ACPI Mode when used
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.
IRQ assignments for this motherboard
PCI INTA PCI INTB PCI INTC PCI INTD
PCI-X slot 1 PBIRQ0 PBIRQ1 PBIRQ2 PBIRQ3
PCI-X slot 2 PBIRQ4 PBIRQ5 PBIRQ6 PBIRQ7
PCI-X slot 3 PBIRQ8 PBIRQ9 PBIRQ10 PBIRQ11
PCI-X slot 4 PAIRQ0 PAIRQ1 PAIRQ2 PAIRQ3
PCI slot 1 PIRQF PIRQG PIRQH PIRQE
AGP Pro slot PIRQA PIRQB — —
Onboard 82540EM controller PIRQD — — —
When using PCI cards on shared slots, ensure that the drivers support
“Share IRQ” or that the cards do not need IRQ assignments.
Otherwise, conflicts will arise between the two PCI groups, making the
system unstable and the card inoperable.