0
N/A
System Timer
1
N/A
Keyboard Controller
2
N/A
Programmable Interrupt
3 *
8
Communications Port (COM2)
4 *
9
Communications Port (COM1)
5 *
6
Sound Card (sometimes LPT2)
6 *
11
Floppy Disk Controller
7 *
7
Printer Port (LPT1)
8
N/A
System CMOS/Real Time Clock
9 *
10
ACPI Mode when enabled
10 *
3
IRQ Holder for PCI Steering
11 *
2
IRQ Holder for PCI Steering
12 *
4
PS/2 Compatible Mouse Port
13
N/A
Numeric Data Processor
14 *
5
Primary IDE Channel
15 *
1
Secondary IDE Channel
* 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:
INT A
INT B
INT C
INT D
INT E
INT F
INT G
INT H
Slot 1
Slot2
Slot3
Slot4
Onboard VGA
Onboard USB
Onboard USB 1
Onboard USB 2
LAN
AC97/MC97
IMPORTANT!
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.
2-6 Connectors, Headers
2-6-1 Connectors
(1)
Power Connector (20-pin block) : ATXPWR
ATX Power Supply connector. This is a new defined 20-pins connector that usually
comes with ATX case. The ATX Power Supply allows to use soft power on momentary
12
