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System interrupt specifications
Hardware IRQ | System function |
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IRQ0 | System timer |
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IRQ1 | Standard |
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IRQ2 | Cascaded |
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IRQ3 | Intel 82801DB/DBM USB2 Enhanced Host |
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IRQ4 | COM1 |
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IRQ5* | Conexant |
| Fax Modem with SmartCP |
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IRQ6 | Diskette drive |
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IRQ7* | Parallel port |
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IRQ8 | System |
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IRQ9* | Microsoft |
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IRQ10* | Intel USB UHCI |
| Intel 82852/82855 GM/GME Graphic Controller |
| Realtek RTL8139 Family PCI Fast Ethernet Controller |
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IRQ11 | Intel USB EHCI |
| Intel USB UHCI |
| Intel USB UHCI |
| Intel Pro/Wireless 2200BG |
| TI OHCI 1394 host controller |
| TI PCI1410 CardBus controller |
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IRQ12 | Synaptics PS/2 TouchPad |
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IRQ13 | Numeric data processor |
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IRQ14 | Primary IDE channel |
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IRQ15 | Secondary IDE channel |
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IRQ16 | Intel ICH9 Family USB universal host controller 2937 |
| Mobile Intel 4 Series Express Chipset Family |
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IRQ17 | High definition audio controller |
| Intel ICH9 Family USB universal host controller 2938 |
| Marvell Yukon 88E8072 |
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IRQ18 | Intel ICH9 Family USB universal host controller 2939 |
| Intel ICH9 Family USB universal host controller 2936 |
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IRQ19 | Intel ICH9 Family USB2 enhanced controller 293C |
|
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IRQ20 | Intel ICH9 Family USB2 enhanced controller 293A |
| Intel ICH9 Family USB universal host controller 2934 |
|
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IRQ21 | Intel |
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IRQ22 | Intel ICH9 Family USB universal host controller 2935 |
*Default configuration; audio possible configurations are IRQ5, IRQ7, IRQ9, IRQ10, or none.
✎PC Cards 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.
Specifications |