SOYO 5EAS5 User's Manual & Technical Reference page 17

Dual voltage CPUs are designed to use different voltages for Vio and
Vc ore. They include P55CX and the Cyrix 6x86L / 6x86MX. Refer
to the following figure to set the voltage for these CPUs:
JP32
JP31
Figure 2-2-3 Dual Voltage CPU
Note: Due to varying desings, please ask your dealer for the correct
voltage settings for your specific CPU.
586
CPU
Family
2
4
3.2V CPU
2.9V CPU
2.8V CPU
2.1V CPU
JP30
4
2