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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
A
PCIX 1
—
PCI slot 2
—
PCI slot 3
—
Onboard Gigabit LAN
—
Onboard VGA controller
—
BMC mini-PCI slot
—
Zero Channel RAID slot*
—
SODIMM RAID controller*
—
* On SATA and SCSI models only.
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.
ASUS PSCH-SR motherboard
Priority
1
2
N/A
11
12
13
14
15
3
4
5
6
7
8
9
10
B
C
D
E
—
—
—
—
—
—
—
shared shared shared shared
—
—
—
shared shared shared shared
—
used
—
—
—
—
—
—
—
—
—
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
F
G
H
PXIRQ0 PXIRQ1 PXIRQ2 PXIRQ3
—
—
—
shared shared shared shared
—
—
—
—
—
—
—
—
shared
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
shared
—
—
—
shared
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