Interrupt Controllers - HP Vectra VL420 Technical Reference Manual

BIOS Overview

Interrupt Controllers

The Interrupt Requests (IRQs) are numbered sequentially, starting with the master controller, and
followed by the slave.
Windows 98 and Windows NT4
IRQ
(Interrupt
Vector)
INTR
IRQ0
IRQ1
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
IRQ8
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
44 product description
Channel
0
1
2
3
4
5
6
7
Interrupt Request Description
System Timer
Keyboard Controller
Used by serial port if enabled
Used by serial port if enabled
Free if not used for parallel port or audio
Floppy Disk Controller
LPT1
RTC
Available for PCI devices, if not used by USB
port
Available for PCI devices, if not used by USB
port
Available for PCI devices, if not used by USB
port
Mouse
Co-processor
IDE Primary channel
IDE Secondary channel. Free unless disabled
DMA controller
Function
Free
Free if not used for parallel port in Setup
Floppy disk controller
Free if not used for parallel port in Setup
Used to cascade DMA channels 0-3
Free
Free
Free
Windows 2000 and Windows XP
IRQ
(Interrupt
Vector)
INTR
ISA0
ISA1
ISA3
ISA4
ISA6
ISA8
ISA9
ISA12
ISA13
ISA14
ISA15
PCI5
PCI17
PCI19
PCI20
PCI 23
Interrupt Request Description
System Timer
Standard 101/102-Key or Microsoft Natural
PS/2 keyboard
Communication Port (COM2)
Communication Port (COM1)
Standard Floppy Disk Controller
System CMOS/real time clock
Microsoft ACPI-Compliant System
PS/2 Compatible Mouse
Numeric data processor
Primary IDE Channel
Secondary IDE Channel
Intel(R) 82801BA/BAM SMBus Controller -
2443
Intel(R) 82801BA/BAM AC'97 Audio
Controller - 2445
Intel(R) 82801BA/BAM USB Universal Host
Controller - 2442
Intel(R) PRO/100 VE Network Connection
Intel(R) 82801BA/BAM USB Universal Host
Controller - 2444