SOLTEK SL-53D5-S, User'S Manual & Technical Reference, Page: 17 / 44

12
Jumper Settings
JBAT1: Clear CMOS Data
Clear the CMOS memory by shorting this jumper
momentarily; then remove the cap to retain new settings.
COMS Data JBAT1
Clear Data
1
Retain Data
(default)
1
JBF & JCK: Bus Ratio and External Bus Clock Select
Set the jumper according to your CPU clock.
JBF1~3 1.5x
3.5x 2.0x 2.5x 3.0x
CPU
Bus
Ratio
Setting
JBF1
JBF2
JBF3
JBF1
JBF2
JBF3
JBF1
JBF2
JBF3
JBF1
JBF2
JBF3
JCK1~3 50MHz 55MHz 60MHz
CPU Clock
Setting
1
JCK3 JCK2 JCK1
1
JCK3 JCK2 JCK1
1
JCK3 JCK2 JCK1
66MHz 75MHz 83MHz
1
JCK3 JCK2 JCK1
1
JCK3 JCK2 JCK1
1
JCK3 JCK2 JCK1