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Chapter 5: Motherboard Information
5.6.2 Standard Interrupt Assignments
IRQ Standard Function
0 System Timer
1 Keyboard Controller
2 Programmable Interrupt Controller
3* USB Universal Host Controller
4* Communications Port (COM1)
5* Onboard Audio
6 Standard Floppy Disk Controller
7* Printer Port (LPT1)
8 System CMOS/Real Time Clock
9* Onboard LAN
10* USB Universal Host Controller
11* Onboard VGA
12* PS/2 Compatible Mouse Port
13 Numeric Data Processor
14* Ultra ATA Controller
15* Secondary Ultra ATA Controller
*These IRQs are usually available for ISA or PCI devices.
IRQ assignments for this motherboard
ABCD
PCI slot 1 — shared — —
PCI slot 2 — — shared —
Onboard USB controller HC0 — — — shared
Onboard USB controller HC1 — — — shared
Onboard LAN — — shared —
Onboard Audio — — shared —
Onboard VGA shared — — —
