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4 HP BIOS
BIOS Addresses
Interrupt Controllers
The system has an APIC (82093AA) I/O interrupt controller and two 82C59
“legacy” interrupt controllers.
The following table shows how the “legacy” interrupts are connected to the
APIC controller. The Interrupt Requests (IRQ) are numbered sequentially,
starting with the master controller, and followed by the slave (both of 82C59
type).
I/O APIC
Input
IRQ Interrupt Request Description
INTIN0 INTR
INTIN1 IRQ1 NS317 Keyboard Controller
INTIN2 IRQ0 PIIX4 System Timer
INTIN3 IRQ3 NS317 COM2, COM4
INTIN4 IRQ4 NS317 COM1, COM3
INTIN5 IRQ5 AD1816, LPT2
INTIN6 IRQ6 NS317 Flexible Disk Controller
INTIN7 IRQ7 NS317 LPT1
INTIN8 IRQ8 NS317 RTC
INTIN9 IRQ9
INTIN10 IRQ10
INTIN11 IRQ11 AD1816 MIDI
INTIN12 IRQ12 NS317 Mouse
INTIN13 not connected
INTIN14 IRQ14 PIIX4 IDE
INTIN15 IRQ15
INTIN16 PCINTA
INTIN17 PCINTB
INTIN18 PCINTC
INTIN19 PCINTD
INTIN20 TFPC IRQ
INTIN21 SCI IRQ
INTIN22 not connected
INTIN23 PIIX4 SM
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