Filter
Top Products
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.
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.
IRQ assignments for this motherboard
PCI INTA PCI INTB PCI INTC PCI INTD
PCIX1 slot (supports ZCR) PIRQB4 PIRQB5 PIRQB9 PIRQB8
PCIX2 slot PIRQB0 PIRQB1 PIRQB2 PIRQB3
PCIX3 slot PIRQA4 PIRQA5 PIRQA6 PIRQA7
PCIX4 slot (riser slot A) PIRQA0 PIRQA1 PIRQA2 PIRQA3
PCIX4 slot (riser slot B) PIRQA4 PIRQA0 PIRQA1 PIRQA2
PCIX4 slot (riser slot C) PIRQA5 PIRQA3 PIRQA1 PIRQA2
PCI1 slot PIRQA PIRQB PIRQC PIRQD
PCI2 slot PIRQH PIRQD PIRQB PIRQC
Onboard 82540 controller PIRQE ———
Onboard 82544GC controller PIRQA8 ———
Onboard SCSI controller* PIRQB8 PIRQB9 ——
Onboard VGA controller PIRQF ———
Onboard P64H2 controller PIRQG ———
*Available only on PU-DLS model.
PIRQA~H are ICH3 interrupt inputs.
PIRQAn~Bn are P64H2 PCI A/B interrupt inputs.