Updated: Thursday, March 27, 1996

Contents

• Jumper Locations and Definitions
• CPU Configuration
• Other Jumpers

Jumper Locations and Definitions

CPU Configuration (J7K1-B, C, D)
These jumpers allow the motherboard to be switched between different speeds of the Pentium processor. These jumpers also affect the PCI and ISA clock speeds according to the following table.

CPU/SYSTEM Speed Settings

CPU Freq. (MHz)	Host Bus Freq. (MHz)	J7K1-C	J7K1-D	CPU Clock Multiplier
200	66	1-2,5-6	1-2,5-6	3
166	66	1-2,5-6	2-3,5-6	2.5
150	60	2-3,4-5	2-3,5-6	2.5
133	66	1-2,5-6	2-3,4-5	2
120	60	2-3,4-5	2-3,4-5	2
100	66	1-2,5-6	1-2,4-5	1.5
90	60	2-3,4-5	1-2,4-5	1.5
75	50	2-3,5-6	1-2,4-5	1.5
reserved	-	2-3,5-6	1-2,5-6	-
reserved	-	2-3,4-5	1-2,5-6	-

Clear CMOS (J7K1-A, Pins 4,5,6)
Allows CMOS settings to be reset to default values by moving the jumper from pins 4-5 to pins 5-6 and turning the system on. When the system reports that "NVRAM cleared by jumper", the system can be turned off, and the jumper should be returned to the 4-5 position to restore normal operation. This procedure should be done whenever the system BIOS is updated. Default is for this jumper to be on pins 4-5.

Password Clear (J7K1-A, Pins 1,2,3)
Allows system password to be cleared by moving the jumper from pins 1-2 to pins 2-3 and turning the system on. The system should then be turned off and the jumper should be returned to the 3-5 position to restore normal operation. This procedure should only be done if the user password has been forgotten. The password function is effectively disabled if this jumper is in the 1-3 position. Default is for the password to be enabled (3-5 position).

CMOS Setup Access (J7K1-B, Pins 1,2,3)
Allows access to CMOS Setup utility to be disabled by moving this jumper from the 1-2 position to the 2-3 position. Default is for access to setup to be enabled (1-2 position)

VR/OVD (J7K1-B, Pins 4,5,6)
This jumper block changes the output of the on-board voltage regulator. The default setting (pins 4-5) should be jumpered for processors that require voltages between 3.135 volts and 3.6 volts. Pins 5-6 should be jumpered for processors requiring 3.4 volts to 3.6 volts. Check the microprocessor's documentation for the correct setting. This jumper should not be changed by the user unless changing to a new processor type.

Other Jumpers

Program Boot Block Enable (J1F1, Pins 4,5,6)
This jumper allows the boot block to be programmed when set to Program (pins 5-6). The default setting is Protect (pins 4-5). CAUTION:Changing this jumper and reprogramming the boot block could cause unreliable operation.

Recovery Boot Enable (J1F1, Pins 1,2,3)
This jumper allows the BIOS to be recovered if it has been corrupted. To set the jumper to Recover, move the jumper from pins 1-2 to pins 2-3. Default setting is for Normal operation (pins 1-2).