Asus M3A78-EM - Manual (Page 34)

1-22 Chapter 1: Product introduction
* These IRQs are usually available for ISA or PCI devices.
Interrupt.assignments
IRQ Standard.function
0 System timer
1 Standard 101/102-Key or Microsoft Natural Keyboard
2 Programmable interrupt controller
3 Standard OpenHCI USB Host Controller
4 Communications Port (COM 1)
5 ACPI IRQ Holder for PCI IRQ Steering
6 (free)
7 (free)
8 System CMOS / Real Time Clock
9 SCI IRQ used by ACPI bus
10 Standard PCI Graphics Adapter (VGA)
11 (free)
12 Microsoft PS/2 Port Mouse
13 Numeric data processor
14 Primary IDE controller (single fifo)
15 Secondary IDE controller (single fifo)