Chapter 4
107
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).
NOTE
Although the Setup program can be used to change some of the settings, the
following address map is not completely BIOS dependent, but is determined
partly by the operating system. Note that some of the I/O addresses are
allocated dynamically.
Table 4-6. The Relationship of the “Legacy” Interrupts to the APIC Controller
I/O APIC Input
IRQ
Interrupt Request Description
INTIN0
PIIX4E INTR
INTIN1
IRQ1
NS317 Keyboard Controller
INTIN2
IRQ0
PIIX4E 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
PIIX4E IDE Channel 1
INTIN15
IRQ15
INTIN16
PCINTA
INTIN17
PCINTB
INTIN18
PCINTC
INTIN19
PCINTD
INTIN20
TFPC IRQ
INTIN21
SCI IRQ
INTIN22
not connected
INTIN23
PIIX4E SMI
(not used)
Summary of Contents for X Class 500/550MHz
Page 6: ...6 Contents ...
Page 8: ...8 Figures ...
Page 15: ...15 1 System Overview ...
Page 66: ...66 Chapter2 System Board Devices on the ISA Bus ...
Page 96: ...96 Chapter3 Interface Boards and Mass Storage Drivers Connectors and Sockets ...
Page 134: ...134 Chapter5 Tests and Error Messages Beep Codes ...
Page 135: ...135 A Regulatory Information and Warranty ...
Page 146: ...146 AppendixA Regulatory Information and Warranty HP Hardware Warranty ...