Connector Pin Assignments A-25
Table A-35 Front Panel I/O Connectors
Connector
Pin
Signal Name
Connector
Pin
Signal Name
Speaker
27
SPKR_HDR
Infrared
11
IRLS1
26
PIEZO_IN
10
Ir TX
25
Key
9
Ground
24
Ground
8
Ir RX
Reset
23
SW_RST
7
Key
22
Ground
6
+5 V
21
Key
5
Key
Power/Sleep LED
20
PWR_LED
Sleep/Resume
Switch
4
SLEEP_PU (pullup)
19
Key
3
SLEEP
18
PWR_LED
Power On
2
Ground
17
Key
1
SW_ON#
Hard Drive LED
16
HD_PWR
15
HD Active#
14
Key
13
HD_PWR
12
Key
Speaker
The onboard piezo speaker is enabled by a jumper on pins 26-27 of the front panel
connector. The onboard speaker can be disabled by removing the jumper, and an offboard
speaker can be connected in its place. The speaker (onboard or offboard) provides error
beep code information during the POST in the event that the computer cannot use the video
interface. The speaker is not connected to the audio subsystem and does not receive output
from the audio subsystem.
Reset
This header can be connected to a momentary SPST type switch that is normally open.
When the switch is closed, system board resets and runs the POST.
Power/Sleep LED
This header can be connected to multicolor LED that lights when the computer is powered
on or in sleep mode. The possible states for this LED are listed in Table A-36.