1.8.3 Interrupt
assignments
Standard interrupt
assignments
IRQ | Standard Function |
0System Timer
1Keyboard Controller
2
4Communications Port (COM1)*
5IRQ holder for PCI steering*
6Floppy Disk Controller
7Printer Port (LPT1)*
8System CMOS/Real Time Clock
9IRQ holder for PCI steering*
10IRQ holder for PCI steering*
11IRQ holder for PCI steering*
12PS/2 Compatible Mouse Port*
13Numeric Data Processor
14Primary 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 | — | — | — | — | — | — | ||
PCI Express x16 slot | shared | — | — | — | — | — | — | — |
PCI Express x1 slot | shared | — | — | — | — | — | — | — |
Onboard USB controller 1 | — | — | — | — | shared | — | — | — |
Onboard USB controller 2 | — | shared | — | — | — | — | — | — |
Onboard USB controller 3 | — | — | shared | — | — | — | — | — |
Onboard USB controller 4 | — | — | — | shared | — | — | — | — |
Onboard USB 2.0 controller | — | — | — | — | shared | — | — | — |
Onboard IDE port | — | — | — | — | — | — | shared | — |
Onboard HD audio | — | — | — | shared | — | — | — | — |
Onboard LAN | — | shared | — | — | — | — | — | — |
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 |