Standard interrupt
assignments
IRQ | Priority | Standard Function |
|
0 | 1 | System Timer |
|
1 | Keyboard Controller |
| |
2 | - | Programmable interrupt |
|
3 | 11 | Communications Port (COM2)* |
|
4 | 12 | - |
|
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 | MIDI port* |
|
11 | 6 | IRQ holder for PCI steering* |
|
12 | 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.
IRQ
assignments for this motherboard
| A | B | C | D | E | F | G | H |
PCI slot 1 | shared | — | — | — | — | — | — | — |
PCI slot 2 | — | shared | — | — | — | — | — | — |
PCI Express x16 slot | — | — | — | — | — | — | — | shared |
PCI Express x1 slot 1 | — | — | — | — | — | — | — | 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 SATA Controller | — | shared | — | — | — | — | — | — |
Onboard Audio Controller | — | shared | — | — | — | — | — | — |
Onboard LAN | shared | — | — | — | — | — | — | — |
Integrated graphics | shared | — | — | — | — | — | — | — |
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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 |
