Asus P5VDC-MX manual Interrupt assignments, Standard interrupt assignments

1.8.3Interrupt assignments

Standard interrupt assignments

I R Q	Priority	Standard Function
0	1	System Timer
1	2	Keyboard Controller
2	•	Re-direct to IRQ#9
4	12	Communications Port (COM)*
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	IRQ holder for PCI steering*
11	6	PCI-E x1
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
PCI slot 1	Ñ	shared	Ñ	Ñ
PCI slot 2	Ñ	Ñ	shared	Ñ
PCIe x1 slot*	Fixed	Fixed	Fixed	Fixed
AGP 8X slot	shared	Ñ	Ñ	Ñ
Onboard USB controller 1	shared	Ñ	Ñ	Ñ
Onboard USB controller 2	Ñ	Ñ	shared	Ñ
Onboard USB controller 3	Ñ	shared	Ñ	Ñ
Onboard USB controller 4	Ñ	Ñ	Ñ	shared
Onboard USB 2.0 controller	Ñ	Ñ	shared	Ñ
Onboard LAN	shared	Ñ	Ñ	Ñ
Onboard audio	Ñ	shared	Ñ	Ñ
Onboard VGA	shared	Ñ	Ñ	Ñ

* The PCIe x1 slot does not need IRQ assignment.

When using PCI cards on shared slots, ensure that the drivers support “Share IRQ” 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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