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S1570-001-01 http://www.tyan.com
CPU Voltage Select: JP27-JP32 Default for P54C/P55C(MMX)
P54C/P55C
Cyrix
JP27
Off
3.6V
JP28
On
3.5V
JP29
Off
3.3V
JP30
Off
On
JP31
On
Off
JP32
On
Off
Heatsink Fan Power: J28
pin1
GND
pin2
+12V
pin3
GND
Keylock/Power LED: JP20
pin1
Power LED +
pin2
NC
pin3
Power LED -
pin4
Keylock
pin5
GND
I/O Port Setting: J39 and J40
J39
J40
For Serial Port 1-2
1-2
For IR Port
2-3
2-3
Turbo LED: JP25
pin1
anode +
pin2
cathode -
Turbo Switch: JP24 (De-Turbo mode not supported)
(Only turns on/off the turbo LED)