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Clear CMOS (JBAT1)
JBAT1 is used to clear CMOS data. Clearing CMOS will result in the perma-
nent erasing of previous system configuration settings and the restoration of
original (factory-default) system settings.
Pin 1-2 (Default)
Pin 2-3 (Clear CMOS)
Step 1.
Turn off the system power (PC-> Off).
Step 2.
Remove ATX Power cable from ATX Power connector.
Step 3.
Remove jumper cap from JBAT1 pins 1-2.
Step 4.
Place the jumper cap on JBAT1 pin 2-3 for a few seconds.
Step 5.
Return the jumper cap to pin 1-2.
Step 6.
Plug ATX Power cable into ATX Power connector.
Step 7.
Turn on the system power (PC-> On).
FSB Speed Configuration Setting (J3)
MK20 provides jumper J3 to set front side bus at 100MHz and 133MHz. Insert
mini-jumper caps on J3 to set FSB to 100MHz. Remove mini-jumper caps from
J3 to set FSB to 133MHz.
Set FSB hardware jumper
to 100MHz. (Default)
Set FSB hardware jumper
to 133MHz.
A3
A4
1
1
1
J3
1
JB
AT
1
1
1
