Table B.3: DMA channel assignments
1 | Available (audio) |
2 | Floppy disk |
3 | Available (parallel port) |
4 | Cascade for DMA controller 1 |
5 | Available |
6 | Available |
7 | Available |
*Audio DMA select 1, 3, or 5
**Parallel port DMA select 1 (LPT2) or 3 (LPT1)
B.4 Interrupt assignments
Table B.4: Interrupt assignments
Interrupt# | Interrupt source |
IRQ 0 | Interval timer |
IRQ 1 | Keyboard |
IRQ 2 | Interrupt from controller 2 (cascade) |
IRQ 3 | COM2 |
IRQ 4 | COM1 |
IRQ 5 | Reserved (COM4) |
IRQ 6 | FDD |
IRQ 7 | LPT1 |
IRQ 8 | RTC |
IRQ 9 | Reserved (audio) |
IRQ 10 | Reserved (COM3) |
IRQ 11 | Reserved |
IRQ 12 | PS/2 mouse |
IRQ 13 | INT from |
IRQ 14 | Primary IDE |
IRQ 15 | Reserved |
Appendix B System Assignments
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