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Hardware Installation 13
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