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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
Onboard VGA
Onboard USB
Onboard USB 1
Onboard USB 2
LAN
AC97/MC97
IMPORTANT!
2-6 Connectors, Headers
2-6-1 Connectors
(1)
Power Connector (20-pin block) : ATXPWR
1
System Timer
2
Keyboard Controller
N/A
Programmable Interrupt
11
Communications Port (COM2)
12
Communications Port (COM1)
13
Sound Card (sometimes LPT2)
14
Floppy Disk Controller
15
Printer Port (LPT1)
3
System CMOS/Real Time Clock
4
ACPI Mode when enabled
5
IRQ Holder for PCI Steering
6
IRQ Holder for PCI Steering
7
PS/2 Compatible Mouse Port
8
Numeric Data Processor
9
Primary IDE Channel
10
Secondary IDE Channel
INT A
INT B
√
√
√
√
If using PCI cards on shared slots, make sure that the drivers support "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
INT C
INT D
INT E
√
√
√
9
INT F
INT G
INT H
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