Asus P4S8X-MX Standard interrupt assignments, IRQ assignments for this motherboard

Standard interrupt assignments

I R Q	Priority	Standard Function
0	1	System Timer
1	2	Keyboard Controller
2	Ð	Programmable Interrupt
4*	12	Communications Port (COM1)
5*	13	IRQ holder for PCI steering
6	14	Floppy Disk Controller
7*	15	Printer Port (LPT1)
8	3	System CMOS/Real Time Clock
9*	4	IRQ holder for PCI steering
10*	5	Advance ACÕ97 CODEC
11*	6	Standard PCI Graphics Adapter (VGA)
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

	A	B	C	D	E	F	G	H
PCI slot 1	Ñ	Ñ	shared	Ñ	Ñ	Ñ	Ñ	Ñ
PCI slot 2	Ñ	Ñ	Ñ	shared	Ñ	Ñ	Ñ	Ñ
PCI slot 3	Ñ	used	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ
AGP slot	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ
Onboard USB controller 1	Ñ	Ñ	Ñ	Ñ	used	Ñ	Ñ	Ñ
Onboard USB controller 2	Ñ	Ñ	Ñ	Ñ	Ñ	used	Ñ	Ñ
Onboard USB controller 3	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	used	Ñ
Onboard USB 2.0 controller	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	used
Onboard LAN	Ñ	Ñ	Ñ	shared	Ñ	Ñ	Ñ	Ñ
Onboard audio	Ñ	Ñ	shared	Ñ	Ñ	Ñ	Ñ	Ñ
Onboard VGA	shared	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ	Ñ

When using PCI cards on shared slots, ensure that the drivers support ÒShare IRQÓ or that the cards do not need IRQ assignments; otherwise, conflicts will arise between the two PCI groups, making the system unstable and the card inoperable.

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