P M - 9 80 0 M A I N B O A R D M A N U A L
8
MISCELLANEOUS PIN CONFIGURA
TIONS
JP1 - CMOS RAM Discharge Selector
PIN
DESCRIPTION
1-2
Normal Mode (default)
2-3
Clear CMOS
Make sure that JP1 is set to Normal Mode (pins
1-2) before installing the mainboard.
JPX1 - CPU Fan Connector
PIN
DESCRIPTION
1
Data
2
+12V
3
Ground
JPX4 - DIMM Voltage Selector
JPX4A
JPX4B
DESCRIPTION
1 - 2
1 - 2
5V
2 - 3
2 - 3
3.3V (default)
SW1 - CPU External Clock Selector
SW1-1
SW1-2
SW1-3 DESCRIPTION
ON
ON
ON
50MHz
OFF
OFF
ON
60MHz
OFF
OFF
OFF 66MHz
ON
OFF
OFF 75MHz
OFF
ON
ON
83MHz
SW2 - CPU Core Voltage Selector
SW2-1
SW2-2
SW2-3 DESCRIPTION
ON
OFF
ON
2.5V
ON
OFF
OFF
2.8V
OFF
ON
ON
2.9V
OFF
OFF
OFF
3.0V
ON
ON
ON
3.0V
OFF
ON
OFF
3.2V
OFF
OFF
ON
3.3V
ON
ON
OFF
3.5V
SW3 - CPU Clock Multiplier Selector
SW3-1
SW3-2
SW3-3 DESCRIPTION
OFF
OFF
N/A
1.5X
ON
OFF
N/A
2.0X
ON
ON
N/A
2.5X
OFF
ON
N/A
3.0X
OFF
OFF
OFF 3.5X
ON
OFF
ON
4.0X
ON
ON
ON
4.5X
