Verbatim 525, 520 manual System Board Switches and Jumpers, SW1 Switch, SW2 Switch

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.

Switch	Default	OFF	ON	COMMENTS
	Setting
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	CMOS Clear	To clear the CMOS configuration. Set the switch to the ON position and
		operation		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	Password Clear	To clear the password. Set the switch to the ON position and restart the
		operation		PC. Return the switch to the OFF position and restart the PC to return to
				normal operation.

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.)

Processor Speeds	Switch Block SW2				Jumper J7 Settings
		Position
	Ratio		1	2	CPU Bus	Pins Shorted
					Frequency
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

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