Appendix C. IRQ and DMA channel assignments
The following tables list the interrupt request (IRQ) and direct memory access (DMA channel assignments.
Table 36. IRQ channel assignments
IRQ | System resource |
|
|
NMI | Critical system error |
|
|
SMI | System management interrupt - power management |
|
|
0 | Reserved (interval timer) |
|
|
1 | Reserved (keyboard) |
|
|
2 | Reserved, cascade interrupt from slave PIC |
|
|
3 | COM2 |
|
|
4 | COM1 |
|
|
5 | LPT2/audio (if present) |
|
|
6 | Diskette controller |
|
|
7 | LPT1 |
|
|
8 | |
|
|
9 | ACPI |
|
|
10 | Available to user |
|
|
11 | Available to user |
|
|
12 | Mouse port |
|
|
13 | Reserved (math coprocessor) |
|
|
14 | Primary IDE (if present) |
|
|
15 | Secondary IDE (if present) |
|
|
© Copyright IBM Corp. 2000 | 53 |
