Asus T2-AH1 Standard interrupt assignments, IRQ assignments for this motherboard

Standard interrupt assignments

I R Q	Standard Function
0	System Timer
1	Keyboard Controller
2	Programmable Interrupt
4	Communications Port (COM1)
6	Floppy Disk Controller
7*	Printer Port (LPT1)
8	System CMOS/Real Time Clock
9*	ACPI Mode when used
10*	IRQ Holder for PCI Steering
11*	IRQ Holder for PCI Steering
12*	PS/2 Compatible Mouse Port
13	Numeric Data Processor
15*	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	P
USB0	ÐÐ	shared	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ
USB1	ÐÐ	ÐÐ	shared	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ
USB2	ÐÐ	ÐÐ	ÐÐ	used	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ
USB3	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ	used
AC ‘97	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ	used	ÐÐ
Onboard 1394	ÐÐ	ÐÐ	ÐÐ	ÐÐ	used	ÐÐ	ÐÐ	ÐÐ	ÐÐ
Onboard LAN	ÐÐ	shared	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ
Onboard PCIE	ÐÐ	ÐÐ	shared	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ	ÐÐ

When using a PCI card 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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