Jumper Settings; Jbat1: Clear Cmos Data; Jbf & Jck: Bus Ratio And External Bus Clock Select - SOLTEK SL-53D5-S User's Manual & Technical Reference

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
Clear Data
Retain Data
(default)
JBF & JCK: Bus Ratio and External Bus Clock Select
Set the jumper according to your CPU clock.
JBF1~3 1.5x
3.5x
CPU
JBF3
Bus
JBF2
Ratio
JBF1
Setting
JCK1~3 50MHz
1
CPU Clock
Setting
66MHz
1
12
JBAT1
1
1
2.0x 2.5x 3.0x
JBF3 JBF3 JBF3
JBF2 JBF2 JBF2
JBF1 JBF1 JBF1
55MHz 60MHz
1 1
75MHz 83MHz
1 1