2-20
Chapter 2: Hardware information
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
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
9
Primary IDE Channel
IRQ assignments for this motherboard
A
B
C
D
E
F
G
H
PCI slot 1
–
shared
–
–
–
–
–
–
PCI slot 2
–
–
shared
–
–
–
–
–
Onboard 1394
shared
–
–
–
–
–
–
–
PCIE x16_1
shared
–
–
–
–
–
–
–
PCIE x16_2
–
–
–
–
–
shared
–
–
PCIE x 4
–
–
–
–
–
–
shared
–
PCIE x 1
–
–
–
–
shared
–
–
–
