2-18
Chapter 2: Hardware information
2.5.3 Interrupt assignments
IRQ
Priority
Standard Function
0
1
System Timer
1
2
Keyboard Controller
2
—
Re-direct to IRQ#9
3
11
—
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
15
10
Secondary IDE Channel
* These IRQs are usually available for ISA or PCI devices.
A
B
C
D
E
F
G
H
PCI slot 1
— shared
—
—
—
—
—
—
PCI slot 2
—
—
—
—
— shared —
—
PCI slot 3
—
—
—
—
—
— shared —
PCI E x16 slot
shared —
—
—
—
—
—
—
PCI E x1 slot 1
shared —
—
—
—
—
—
—
PCI E x1 slot 2
— shared
—
—
—
—
—
—
Onboard USB controller 0
shared —
—
—
—
—
—
—
Onboard USB controller 1
— shared
—
—
—
—
—
—
Onboard USB controller 2
—
—
shared —
—
—
—
—
Onboard USB controller 3
—
—
— shared —
—
—
—
Onboard EHCI controller
shared —
—
—
—
—
—
—
Onboard IDE port
—
—
—
—
—
— shared —
Onboard SATA port
—
—
—
—
—
—
— shared
Onboard Audio controller
—
—
— shared —
—
—
—
Onboard LAN controller
—
—
shared —
—
—
—
—
Onboard 1394 controller
—
—
—
—
—
—
— shared
Onboard SATA controller
—
—
— shared —
—
—
—
Standard interrupt assignments
IRQ assignments for this motherboard