Standard Interrupt Assignments
IRQ | Priority | Standard Function |
0 | 1 | System Timer |
1 | 2 | Keyboard Controller |
2 | N/A | Programmable Interrupt |
3* | 11 | Communications Port (COM2) |
4* | 12 | Communications Port (COM1) |
5* | 13 | Sound Card (sometimes LPT2) |
6 | 14 | Floppy Disk Controller |
7* | 15 | Printer Port (LPT1) |
8 | 3 | System CMOS/Real Time Clock |
9* | 4 | ACPI Mode when used |
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 |
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*These IRQs are usually available for ISA or PCI devices.
IRQ assignments for this motherboard
| A | B | C |
| D | E | F |
| G | H PXIRQ0 PXIRQ1 PXIRQ2 PXIRQ3 |
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PCIX 1 | — | — | — | — | — | — | — |
| — |
| shared | shared | shared | shared |
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PCI slot 2 | — | — | — | — |
| shared | shared | shared | shared |
| — | — | — | — |
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PCI slot 3 | — | — | — | — |
| shared | shared | shared | shared |
| — | — | — | — |
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Onboard Gigabit LAN | — | — | used | — | — | — | — | — | — |
| — | — | — |
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Onboard VGA controller | — | — | — | — | — | — | — |
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| shared |
| — | — | — | — |
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BMC | — | — | — | — |
| shared | — |
| — | — | — | — | — | — |
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Zero Channel RAID slot* | — | — | — | — | — | — | — |
| — | — |
| — |
| shared | — |
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SODIMM RAID controller* | — | — | — | — | — | — | — |
| — | — |
| — | — |
| shared |
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* On SATA and SCSI models only.
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 |