AOpen AP53 User Manual page 22

Hardware Installation
6. Set jumpers JP1 and JP10
according to the frequency of the
CPU that you install.
7. Set jumper JP11 according to the
CPU voltage.
2-6
CPU FREQUENCY SELECT
JP1
75 MHz
90 MHz
100 MHz
(default)
120 MHz
133 MHz
150 MHz
166 MHz
CPU VOLTAGE SELECT
JP11
3.45V
(default)
3.52V
JP10