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Standard Interrupt Assignments
IRQ
0
1
2
3*
4*
5*
6
7*
8
9*
10*
11*
12*
13
14*
15*
*
These IRQs are usually available for ISA or PCI devices.
IRQ assignments for this motherboard
PCI slot 1
PCI slot 2
PCI slot 3
PCI slot 4
PCI slot 5
PCI slot 6
AGP Pro slot
Onboard 82551QM controller
Onboard SCSI controller
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.
2-12
Priority
1
2
N/A
11
12
13
14
15
3
4
5
6
7
8
9
10
PCI INTA
PCI INTB
1
4
5
8
9
10
11
2
6
Standard Function
System Timer
Keyboard Controller
Programmable Interrupt
Communications Port (COM2)
Communications Port (COM1)
Sound Card (sometimes LPT2)
Floppy Disk Controller
Printer Port (LPT1)
System CMOS/Real Time Clock
ACPI Mode when used
IRQ Holder for PCI Steering
IRQ Holder for PCI Steering
PS/2 Compatible Mouse Port
Numeric Data Processor
Primary IDE Channel
Secondary IDE Channel
PCI INTC
12
13
15
16
18
19
21
22
24
25
27
28
0
—
—
—
7
—
Chapter 2: Hardware information
PCI INTD
14
17
20
23
26
29
—
—
—
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