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7.2 INTERRUPT LEVELS
The table below lists interrupt levels. Interrupt levels 0 to 23 are assigned. A smaller interrupt
level has a higher priority.
List of assignment levels
Interrupt level
IRQ00
IRQ01
IRQ02
IRQ03
IRQ04
IRQ05
IRQ06
IRQ07
IRQ08
IRQ09
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
IRQ16
IRQ17
IRQ18
IRQ19
IRQ20
IRQ21
IRQ22
IRQ23
Assignment may vary depending on whether the device is used or not by the peripheral device
setting of BIOS.
162
Setting at shipment from factory
Counter/timer
Keyboard (PS/2)
Interrupt controller
COM 2
COM 1 (serial port)
(Not used)
(Not used)
(Not used)
System CMOS/realtime clock
Microsoft ACPI-Compliant System
SMBus controller
(Not used)
Touch pad
Math coprocessor
Primary IDE
Secondary IDE
Express Card/PC card bus controller/USB UHCI4 Internal GA, PCI Express Root
Port 2
Wireless LAN/IEEE1394 PCI Express Root Port1
EHCI2/USB UHCI2/SD card
USB UHCI1/SATAAHCI controller
Internal LAN
USB UHCI5
HDA Sound
USB UHCI0/USB EHCI
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Troubleshooting
