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IRQ Assignment Map
ISA Interrupt
IRQ0
IRQ1
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
IRQ8
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
PIRQA
PIRQB
PIRQC
PIRQD
PIRQE
PIRQF
PIRQG
PIRQH
Ser IRQ
NOTE: The BIOS automatically assigns IRQs to devices in the system for legacy compatibility. No method is
provided to manually configure the IRQs for devices.
16
Description
Timer/counter, HPET #0 in legacy replacement Mode. In APIC mode,
cascade from 8259 controller #1
keyboard
Slave controller INTR output. In APICmode timer/counter, HPET#0
Serial port A
Serial port B
Parallel Port (Not implemented)
Floppy
Parallel port, generic (Not implemented)
RTC/HPET#1 in legacy replacement mode
Generic, Option for SCI
Generic, Option for SCI
HPET#2, option for SCSI, TCO
PS2 Mouse
FERR
Primary ATA, legacy mode
Secondary ATA, legacy mode
USB 2.0 Controller #1 and #4
Video
USB 2.0 Controller #3, Native IDE, S-ATA
USB 2.0 Controller #2
Option for SCI, TCO, HPET#0,1,2
Option for SCI, TCO, HPET#0,1,2
Option for SCI, TCO, HPET#0,1,2
USB 2.0 EHCI controller #1, option for SCI, TCo, HPET#0, 1, 2
SIO3
Chapter 1
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