User’s Manual
1.6.3Standard Interrupt Assignments
IRQ |
| Priority |
| Standard Function |
0 |
| 1 |
| System Timer |
1 |
| 2 |
| Keyboard Controller |
2 |
| - |
| Redirect to IRQ#9 |
3 |
| 11 |
| IRQ holder for PCI streering* |
4 |
| 12 |
| Communications Port (COM1)* |
5 |
| 13 |
| IRQ holder for PCI streering* |
6 |
| 14 |
| Floppy Disk Controller |
7 |
| 15 |
| Printer Port (LPT)* |
8 |
| 3 |
| System CMOS/Rear Time |
9 |
| 4 |
| IRQ holder for PCI streeing* |
10 |
| 5 |
| IRQ holder for PCI streeing* |
11 |
| 6 |
| IRQ holder for PCI streeing* |
12 |
| 7 |
| PS/2 Compatible Mouse Port* |
13 |
| 8 |
| Numeric Data Processor |
14 |
| 9 |
| Primary IDE Channel |
15 |
| 10 |
| Secondary IDE Channel |
* There IRQs are usually available for ISA or PCI device.
ATX Main board 33
