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2.5.3 Interrupt assignments
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
Gigabit LAN
Onboard RAID
Onboard 1394
Serial ATA
AGP slot
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.
2-16
Priority
1
2
N/A
11
12
13
14
15
3
4
5
6
7
8
9
10
INT A
shared
—
—
—
shared
—
—
shared
—
shared
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
INT B
INT C
—
—
shared
—
—
shared
—
—
—
—
shared
—
—
shared
—
—
—
shared
—
—
Chapter 2: Hardware information
INT D
—
—
—
used
—
—
—
—
—
—
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