IBM PC 300 Maintenance Service Manual page 125

J19: Front Panel USB Port (Optional)
Pin No. Function
NC
1,4,5,10
+5V
2
GND
3,7,9
USB P0+
6
USB P0-
8
JP18: SPDIF (Optional)
Pin No. Function
1 VCC
2 SPDIF OUT
3 GND
JP19: USB Device Wake up
Pin No. Function
1-2 close Disable USB Device Wake up (Default).
2-3 close Enable USB Device Wake up.
JP20/JP21: Quad Speaker (Optional)
Pin No. Function
1-2 close LINE_IN
2-3 close QUAD OUT
JP24: FWH Write Protection
Pin No. Function
Open Normal (Default)
Close Write Protection.
J12: For 2X11 Pins Jumper
PWR
GD
J12
1
1
RES
Soft PWR: Soft Power Connector
RES: Reset Switch
GN
P+P P HD
1
1
SPKR
Open: Normal Operation
Short: Power On/Off
Open: Normal Operation
Short: For Hardware Reset System
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