Updated: Wednesday, May 1, 1996

Contents

• Jumper Locations and Definitions
• CPU Configuration
• Other Jumpers

Jumper Locations and Definitions

Function			Jumper Block	
		
Pentium® Pro Processor Speed	J25: A-D
Password Clear			J25: E
Clear CMOS			J25: F
CMOS Setup Access		J25: G
Flash Boot Block		J25: H
Reserved			J25: I

Pentium® Pro Processor Speed - Jumper Block J25:A-D
These jumpers allow the board to be configured for different speeds of the Pentium Pro processor. The jumpers also affect the PCI and ISA clock speeds according to the following table:

Jumper A	Jumper B	Jumper C	Jumper D	CPU Freq.	Clk Freq.	Ratio	PCI Freq.	ISA Freq.
UP	UP	UP	DOWN	200	66	3	33	8.31
DOWN	DOWN	UP	DOWN	180	60	3	30	7.51
UP	UP	DOWN	UP	166	66	5/2	33	8.31
DOWN	DOWN	DOWN	UP	150	60	5/2	30	7.51

Password Clear - Jumper J25: E
Allows system password to be cleared by moving jumper to the DOWN position and turning the system on. The system should then be turned off and the jumper returned to the default position of UP to restore normal operation. This procedure should only be done if the user password has been forgotten.

Clear CMOS - Jumper J25: F
Allows CMOS settings to be reset to default values by moving jumper to the to DOWN position and turning the system on. This also will clear all Plug and Play configuration information in the ESCD area. The system should then be turned off and the jumper returned to the default position of UP to restore normal operation.

CMOS Setup Access - Jumper J25: G
Allows access to CMOS Setup Utility to be disabled by moving jumper to the to DOWN position. Default setting is for access to Setup to be enabled with the jumper in the UP position.

Flash Boot Block - Jumper J25: H
Allows a recovery sequence if the system BIOS has been corrupted by moving jumper to the to DOWN position and inserting a BIOS recovery disk. Default setting for the jumper is UP position.

Reserved - Jumper J25: I
This jumper is reserved and should remain in the UP position.

Other Jumpers

CPU Voltage ID Override - Jumper J29
Enables the Pentium Pro processor Voltage ID detection circuitry, if installed. Forces CPU voltage to 3.1V. Default depends on the type of Pentium Pro processor installed when shipped from the factory. Check the Pentium Pro Product Specification to determine which versions of the Pentium Pro processor support voltage identification.

On-Board Speaker Enable - J27 pins 25-26
A jumper located on J27 pins 25-26 enables the on-board speaker. Removing this jumper disables the onboard speaker and allows an external speaker to be connected through a standard header. Default is installed.

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