Asus VIA K8T800, VIA VT8237 Standard interrupt assignments, IRQ assignments for this motherboard

Standard interrupt assignments

IRQ	Priority	Standard Function
0	1	System Timer
1	2	Keyboard Controller
2	N/A	Programmable Interrupt
4*	12	Communications Port (COM1)
5*	13	Sound card (sometimes LPT2)
6	14	Floppy Disk Controller
7*	15	Printer Port (LPT1)
8	3	System CMOS/Real Time Clock
9*	4	ACPI Mode when used
10*	5	IRQ Holder for PCI Steering
11*	6	IRQ Holder for PCI Steering
12*	7	PS/2 Compatible Mouse Port
13	8	Numeric Data Processor
14*	9	Primary IDE Channel
15*	10	Secondary IDE Channel

*These IRQs are usually available for ISA or PCI devices.

IRQ assignments for this motherboard

	INT A	INT B	INT C	INT D	INT E
PCI slot 1	shared	––	––	––	––
PCI slot 2	––	shared	––	––	––
PCI slot 3	––	––	shared	––	––
PCI slot 4	––	––	––	shared	––
PCI slot 5	shared	––	––	––	––
Onboard 1394	shared	––	––	––	––
Serial ATA	––	––	––	––	shared
AGP slot	shared	––	––	––	––
Onboard Audio	––	––	shared	––	––

When using PCI cards on shared slots, ensure that the drivers support “ShareIRQ” or that the cards do not need IRQ assignments. Otherwise, conflicts willarise between the two PCI groups, making the system unstable and the cardinoperable.

1-12 Chapter 1: Product introduction