| Interrupt |
I/O APIC level |
Description |
| INTR |
INT0 |
Processor interrupt |
| NMI |
N/A |
NMI from BUD to processor |
| IRQ0 |
INT2 |
Timer interrupt from PIIX4 |
| IRQ1 |
INT1 |
Keyboard interrupt |
| IRQ2 |
|
Interrupt signal from second 8259 in
PIIX4 |
| IRQ3 |
INT3 |
Serial port A or B interrupt from
87309VLJ device (user configure) |
| IRQ4 |
INT4 |
Serial port A or B interrupt from
87309VLJ device (user configure) |
| IRQ5 |
INT5 |
Open for use |
| IRQ6 |
INT6 |
Diskette |
| IRQ7 |
INT7 |
Parallel port |
| IRQ8_L |
INT8 |
RTC interrupt |
| IRQ9 |
INT9 |
Open for use |
| IRQ10 |
INT10 |
Open for use |
| IRQ11 |
INT11 |
Open for use |
| IRQ12 |
INT12 |
Mouse interrupt |
| IRQ13 |
INT13 |
|
| IRQ14 |
INT14 |
Compatibility IDE interrupt from primary
channel IDE devices 0 and 1 |
| IRQ15 |
INT15 |
Secondary IDE interrupt |
| PCI_INTA_L |
INT16 |
PCI Interrupt signal A |
| PCI_INTB_L |
INT17 |
PCI Interrupt signal B |
| PCI_INTC_L |
INT18 |
PCI Interrupt signal C |
| PCI_INTD_L |
INT19 |
PCI Interrupt signal D |
| SMI_L |
|
System management interrupt—general
purpose error indicator from various sources (controlled by BUD) |
