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2 Casing, System Boards and Video
System Board, Switches and Jumpers
System Board Switches and Jumpers
This section indicates the switches and jumpers used to modify the system
settings.
SW1 Switch
This switch is multi-purpose and is used to modify BIOS, CMOS and
password settings.
SW2 Switch
This switch is used to select the CPU Bus Frequency / CPU Frequency ratio.
The following table includes some examples of the settings to use for
different processor speeds. (Jumper J7 settings are also shown. This jumper
is described on the next page.)
Switch Default
Setting
OFF ON COMMENTS
1 OFF Flashing Enable Flashing Disable Updating the BIOS. Set the security mode. Set the switch to the ON
position to prevent the BIOS from being upgraded.
2 OFF CMOS is in normal
operation
CMOS Clear To clear the CMOS configuration. Set the switch to the ON position and
restart the PC. Return the switch to the OFF position and restart the PC
to return to normal operation.
3 OFF Password is in normal
operation
Password Clear To clear the password. Set the switch to the ON position and restart the
PC. Return the switch to the OFF position and restart the PC to return to
normal operation.
Processor Speeds
Switch Block SW2
Position
Jumper J7 Settings
Ratio
1 2 CPU Bus
Frequency
Pins Shorted
CPU Frequency 133 MHz 1 / 2 ON OFF 66 MHz 3 - 4
CPU Frequency 150 MHz 2 / 5 ON ON 60 MHz 1 - 3
CPU Frequency 166 MHz 2 / 5 ON ON 66 MHz 3 - 4