Specifications

System interrupt specifications

Hardware IRQ

System function

 

 

IRQ0

System timer

 

 

IRQ1

Standard 101-/102-key or Microsoft natural keyboard

 

 

IRQ8

System CMOS/real-time clock

 

 

IRQ12

Synaptics PS/2 TouchPad

 

 

IRQ13

Numeric data processor

 

 

IRQ16

Intel ICH9 family USB universal host controller 2937

 

Mobile Intel 4 Series express chipset family

 

 

*IRQ17

High-definition audio controller

 

Intel ICH9 family USB universal host controller 2938

 

Marvell Yukon 88E8072 PCIE-gigabit Ethernet controller

 

 

IRQ18

Intel ICH9 family USB universal host controller 2939

 

Intel ICH9 family USB universal host controller 2936

 

 

IRQ19

Intel ICH9 family USB2 enhanced controller 293C

 

 

IRQ20

Intel ICH9 family USB2 enhanced controller 293A

 

Intel ICH9 family USB universal host controller 2934

 

 

IRQ21

Intel ICH9M-E/M SATA AHCI controller

 

 

IRQ22

Intel ICH9 family USB universal host controller 2935

*Default configuration; other possible audio configurations are IRQ5, IRQ7, IRQ9, IRQ10, or none.

✎ExpressCards may assert IRQ3, IRQ4, IRQ5, IRQ7, IRQ9, IRQ10, IRQ11, or IRQ15. Either the infrared or the serial port may assert IRQ3 or IRQ4.

✎For operating systems after Windows 2000, APIC (Advanced programming interrupt controller) is used.

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Maintenance and Service Guide