C.4 Interrupt assignments | ||
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| |
| Table C.4: Interrupt assignments | |
| Interrupt# | Interrupt source |
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| IRQ 0 | Interval timer |
| IRQ 1 | Keyboard |
| IRQ 2 | Interrupt from controller 2 (cascade) |
| IRQ 3 | COM2 |
| IRQ 4 | COM1 |
| IRQ 5 | COM4 |
| IRQ 6 | FDD |
| IRQ 7 | LPT1 |
| IRQ 8 | RTC |
| IRQ 9 | Reserved (audio) |
| IRQ 10 | COM3 |
| IRQ 11 | Reserved for watchdog timer |
| IRQ 12 | PS/2 mouse |
| IRQ 13 | INT from |
| IRQ 14 | Primary IDE |
| IRQ 15 | Secondary IDE for CFC |
*Ethernet interface IRQ select: 9, 11, 15
*PNP audio IRQ select: 9, 11, 15
*PNP USB IRQ select: 9, 11, 15
*PNP ACPI IRQ select: 9, 11, 15
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