![](/images/new-backgrounds/1270264/270264219x1.webp)
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 | Mobile Intel® 4 Series Chipset PCI Express Root |
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IRQ3 | Intel® ICH9 Family PCI Express Root |
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IRQ4 | Intel® ICH9 Family PCI Express Root |
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IRQ5 | Intel® ICH9 Family PCI Express Root |
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IRQ6 | Intel® ICH9 Family PCI Express Root |
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IRQ7 | Intel® ICH9 Family PCI Express Root |
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IRQ8 | ATI Mobility Radeon HD 4330 |
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IRQ9 | Intel® WiFi Link 5100 ABG |
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IRQ12 | Synaptics PS/2 Port TouchPad |
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IRQ13 | Numeric data processor |
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IRQ16 | Intel® ICH9 Family USB Universal Host |
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High Definition Audio Controller | |
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Intel® ICH9 Family USB Universal Host | |
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Intel® ICH9 Family USB Universal Host | |
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Intel® ICH9 Family USB Universal Host | |
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Intel® | |
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Intel® ICH9 Family USB Universal Host |
*Default configuration; audio possible configurations are IRQ5, IRQ7, IRQ9, IRQ10, or none.
NOTE: ExpressCards may assert IRQ3, IRQ4, IRQ5, IRQ7, IRQ9, IRQ10, IRQ11, or IRQ15. Either the infrared or the serial port may assert IRQ3 or IRQ4.
100 Chapter 6 Specifications