Interrupt Usage.
The onboard Intel 82801BA provides an ISA compatible interrupt controller with functionality as two 8259A interrupt controllers. The two controllers are cascaded to provide 13 external interrupts.
The actual interrupt settings depend on the PnP handler, the table below indicates the typical settings.
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| Interrupt |
| Description | Note |
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| IRQ0 |
| System timer |
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| IRQ1 |
| Standard |
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| IRQ2 |
| Programmable interrupt controller |
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| IRQ3 |
| Communications Port (COM2) |
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| IRQ4 |
| Communications Port (COM1) |
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| IRQ5 |
| ACPI IRQ Holder for PCI IRQ Steering |
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| IRQ5 |
| Intel(R) 82801BA/BAM USB Universal Host Controller - 2442 |
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| IRQ5 |
| Intel |
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| IRQ6 |
| Standard Floppy Disk Controller |
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| IRQ7 |
| Printer Port (LPT1) |
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| IRQ8 |
| System CMOS/real time clock |
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| IRQ9 |
| SCI IRQ used by ACPI bus |
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| IRQ10 |
| Intel(R) PRO/100 VE Network Connection |
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| IRQ10 |
| ACPI IRQ Holder for PCI IRQ Steering |
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| IRQ10 |
| Intel(R) 82801BA/BAM USB Universal Host Controller - 2444 |
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| IRQ10 |
| ACPI IRQ Holder for PCI IRQ Steering |
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| IRQ11 |
| Intel(R) 82815 Graphics Controller |
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| IRQ11 |
| ACPI IRQ Holder for PCI IRQ Steering |
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| IRQ12 |
| PS/2 Compatible Mouse Port |
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| IRQ13 |
| Numeric data processor |
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| IRQ14 |
| Intel(R) 82801BA Ultra ATA Storage Controller - 244B |
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| IRQ14 |
| Primary Ultra ATA Controller |
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| IRQ15 |
| Intel(R) 82801BA Ultra ATA Storage Controller - 244B |
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| IRQ15 |
| Secondary Ultra ATA Controller |
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