ASUS M3A
2-17
2.5.3
Interrupt assignments
Standard interrupt assignments
* These IRQs are usually available for ISA or PCI devices.
IRQ
Priority Standard function
0
1
System Timer
1
2
Keyboard Controller
2
–
Redirect to IRQ#9
3
9
IRQ Holder for PCI Steering*
4
12
Communications Port (COM1)*
5
13
IRQ Holder for PCI Steering*
6
14
Floppy Disk Controller
7
15
Printer Port (LPT1)*
8
3
System CMOS/Real Time Clock
9
4
IRQ Holder for PCI Steering*
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
10
Primary IDE Channel
15
11
Secondary IDE Channel
IRQ assignments for this motherboard
A
B
C
D
E
F
G
H
PCIE x16
shared
–
–
–
–
–
–
–
PCIE x1_1
shared
–
–
–
–
–
–
–
PCIE x1_2
–
shared
–
–
–
–
–
–
LAN (L1)
–
–
shared
–
–
–
–
–
PCI slot 1
shared
–
–
–
–
–
–
–
PCI slot 2
–
shared
–
–
–
–
–
–
PCI slot 3
–
–
shared
–
–
–
–
–
