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Some expansion cards need an IRQ to operate. Generally, an IRQ must exclusively
assign to one use. In a standard design, there are 16 IRQs available but most of them
are already in use.
Standard Interrupt Assignments
IRQ
Priority
0
1
2
3 *
4 *
5 *
6 *
7 *
8
9 *
10 *
11 *
12 *
13
14 *
15 *
* These IRQs are usually available for ISA or PCI devices.
2-5-3 Interrupt Request Table For This Motherboard
Interrupt request are shared as shown the table below:
Slot 1
Slot 2
Slot 3
Onboard USB 1
Onboard USB 2
AC97/MC97
LAN
IMPORTANT! If using PCI cards on shared slots, make sure that the drivers support
2-5-4 AGP Slot
This motherboard provides an AGP Slot, support the 2X/4X AGP VGA card.
N/A
System Timer
N/A
Keyboard Controller
N/A
Programmable Interrupt
8
Communications Port (COM2)
9
Communications Port (COM1)
6
Sound Card (sometimes LPT2)
11
Floppy Disk Controller
7
Printer Port (LPT1)
N/A
System CMOS/Real Time Clock
10
ACPI Mode when enabled
3
IRQ Holder for PCI Steering
2
IRQ Holder for PCI Steering
4
PS/2 Compatible Mouse Port
N/A
Numeric Data Processor
5
Primary IDE Channel
1
Secondary IDE Channel
INT A INT B INT C INT D INT E
√
√
"Shared IRQ" or that the cards don't need IRQ assignments. Conflicts will
arise between the two PCI groups that will make the system unstable or
cards inoperable.
Standard function
√
√
√
√
11
INT F
INT G INT H
√
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