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3 BIOS Overview
BIOS Addresses
Interrupt Controllers
The Interrupt Requests (IRQ) are numbered sequentially, starting with
the master controller, and followed by the slave.
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, optimal system performance is reached when
minimizing the sharing of interrupts.
IRQ
Interrupt Request Description
IRQ0
System Timer
IRQ1
Keyboard Controller
IRQ3
If not used for serial port, available for PCI devices, ISA board, USB port, audio
or video
IRQ4
Used by serial port if enabled. If not, available for PCI devices, ISA board, USB
port, audio or video
IRQ5
If not used for parallel port, available for PCI devices, ISA board, USB port,
audio or video
IRQ6
Floppy Disk Controller
IRQ7
LPT1
IRQ8
RTC
IRQ9
Available for PCI devices, if not used by ISA board, USB port, audio or video
IRQ10
Available for PCI devices, if not used by ISA board, USB port, audio or video
IRQ11
Available for PCI devices, if not used by ISA board, USB port, audio or video
IRQ12
Mouse
IRQ13
Co-processor
IRQ14
IDE Primary channel
IRQ15
IDE Secondary channel. Free unless disabled
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