10
To simplify this process the motherboard has complied with the Plug and Play (PNP)
specification which was developed to allow automatic system configuration whenever a PNP-
compliant card is added to the system. For PNP cards, IRQs are assigned automatically from
those available.
If the system has both Legacy and PNP ISA cards installed, IRQs are assigned to PNP cards
from those not used by Legacy cards. The PCI and PNP configuration of the BIOS setup utility
can be used to indicate which IRQs are being used by Legacy cards. For older Legacy cards
that does not work with the BIOS, you can contact your vendor for an ISA Configuration Utility.
An IRQ number is automatically assigned to PCI expansion cards after those used by Legacy
and PNP ISA cards. In the PCI bus design, the BIOS automatically assigns an IRQ to a PCI. To
install a PCI card, you need to set something called the INT (interrupt) assignment. Since all
the PCI slots on this motherboard use an INTA #, be sure that the jumpers on your PCI cards
are set to INT A.
Assigning DMA Channels for ISA Cards
Some ISA cards, both Legacy and PNP may also need to use a DMA (Direct Memory Access)
channel. DMA assignments for this motherboard are handled the same way as the IRQ
assignment process described above. You can select a DMA channel in the PCI and PNP
configuration section of the BIOS Setup utility. In the BIOS setup, you should choose “Yes” for
those IRQ’s and DMA’s you wish to reserve for Legacy cards.
2-6 External Connectors
1. ATX Power Connector (20-pin block): CN1
ATX Power Supply connector. This is a new defined 20-pin connector that usually comes
with ATX case. The ATX Power Supply allows to use soft power on momentary switch that
connect from the front panel switch to 2-pins Power On jumper pole on the motherboard.
When the power switch on the back of the ATX power supply turned on, the full power will
not come into the system board until the front panel switch is momentarily pressed. Press
this switch again will turn off the power to the system board.
C
O
M
2
PIN
ROW2
ROW1
1
3.3V
3.3V
2
-12V
3.3V
3
GND
GND
4
Soft Power On
5V
5
GND
GND
6
GND
5V
7
GND
GND
8
-5V
Power OK
9
+5V
+5VSB (for Soft Logic)
10
+5V
+12V
ATX Power Connector
Pin 1
2. PS/2 Mouse & PS/2 Keyboard Connector: KB/MS
