22
2.3.14.3 RESET header (RESET)
The 2-pin reset header is located on pins 9--10 (marked as RESET) of the front panel
connector. It can be connected to a momentary type switch that is normally open. When the
switch is close, the system will reset.
Signal of RESET header
Pin 9
RESET
Pin 10
Ground
2.3.14.4 Power LED and keylock switch header (KEYLOCK)
The 5-pin keylock switch header is located on pins 11--15 (marked as KEYLOCK) of the
front panel. It has two functions: Power LED and Keylock switch. The power LED can be
connected to a chassis’s LED. When the computer is powered on, the LED will be lighted
up. The keylock header can be connected to a switch on the chassis. When the switch is
close, keyboard function will be disabled temporarily until the switch is open.
Signal of KEYLOCK header
Pin 11
Anode (+)
Pin 12
NC
Pin 13
Cathode (-)
Pin 14
KEYLOCK
Pin 15
Ground
2.3.14.5 SPEAKER header (SPEAKER)
The 4-pin speaker header is located on pins 17--20 (marked as SPEAKER) of the front
panel connector. The speaker provides error beep code information during the POST in the
event that the computer can not use the video interface.
Signal of SPEAKER header
Pin 17
VCC
Pin 18
Ground
Pin 19
NC
Pin 20
BUZZ
