C.4 Interrupt assignments
Table C.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 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
| 90 |
