4 HP BIOS
BIOS Addresses
Interrupt Controllers
The Interrupt Requests (IRQ) are numbered sequentially, starting with the master controller, and followed by the slave.
IRQ | Interrupt Request Description | |
(Interrupt Vector) | ||
| ||
|
| |
INTR |
| |
|
| |
IRQ1 | NS317 Keyboard Controller | |
|
| |
IRQ0 | PIIX4 System Timer | |
|
| |
IRQ3 |
| |
|
| |
IRQ4 | NS317 COM1, COM3 | |
|
| |
IRQ5 | AD1816, LPT2 | |
|
| |
IRQ6 | NS317 Flexible Disk Controller | |
|
| |
IRQ7 | NS317 LPT1 | |
|
| |
IRQ8 | NS317 RTC | |
|
| |
IRQ9 |
| |
|
| |
IRQ10 |
| |
|
| |
IRQ11 |
| |
|
| |
IRQ12 | NS317 Mouse | |
|
| |
not connected |
| |
|
| |
IRQ14 | PIIX4 IDE | |
|
| |
IRQ15 |
| |
|
|
PCI Interrupt Request Lines
PCI devices generate interrupt requests using up to four PCI interrupt request lines (INTA#, INTB#, INTC#, and INTD#).
PCI interrupts can be shared; several devices can use the same interrupt. However, optional system performance is reached when minimizing the sharing of interrupts. Refer to pages 27 and 28 for the Desktop and Mini- tower Backplane PCI Mapping tables, and page 39 for a table of the PCI device interrupts.
83
