11
Installing the Motherboard
Hard Drive Activity LED
Connecting pins 1 and 3 to a front panel mounted LED provides visual indication that data
is being read from or written to the hard drive. For the LED to function properly, an IDE
drive should be connected to the onboard IDE interface. The LED will also show activity
for devices connected to the SCSI (hard drive activity LED) connector.
Front Panel Header
The front panel header (PANEL1) provides a standard set of switch and LED headers
commonly found on ATX or micro-ATX cases. Refer to the table below for information:
ATX12V: ATX 12V Power Connector
SPK1: Internal speaker
Pin Signal Name
1 Signal
2 Key
4 VCC
3 Ground
ATX1: ATX 20-pin Power Connector
1 +3.3V 11 +3.3V
2 +3.3V 12 -12V
10 +12V 20 +5V
3 Ground 13 Ground
4 +5V 14 PS ON#
5 Ground 15 Ground
6 +5V 16 Ground
7 Ground 17 Ground
8 PWRGD 18 -5V
9 +5VSB 19 +5V
Pin Signal Name Pin Signal Name
Pin Signal Name Function
1 HD_LED_P Hard disk LED(+)
2 FP PWR/SLP *MSG LED(+)
3 HD_LED_N Hard disk LED(-)
5 RST_SW_N Reset Switch(-)
7 RST_SW_P Reset Switch(+)
9 RSVD Reserved
4 FP PWR/SLP *MSG LED(-)
6 PWR_SW_P Power Switch(+)
8 PWR_SW_N Power Switch(-)
10 Key No pin
* MSG LED (dual color or single color)
Pin Signal Name Function
Pin Signal Name
4 +12V
3 +12V
2 Ground
1 Ground
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