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Motherboard Jumper Settings (Pentium 1)

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This document provides technical information about using the jumper blocks on the motherboard.
NOTE: This document contains procedures that are highly technical. The person performing these procedures should have extensive computer experience working with both hardware and software.

Applicable models

7320 7330Z 7335 7340P
7350P 7360 7360P 7365
7370V 7410P 7400 7420

Configuration jumpers (J1F1)

NOTE: For more information about using the jumpers listed in this table, see the appropriate section below.
FunctionJumper BlockConfiguration
Password clear J1F1-A 1-2 Password enabled (default)

2-3 Password clear/disabled
CMOS clear J1F1-A 4-5 Keep (default)

5-6 Clear
CMOS Setup Access J1F1-B 1-2 Access allowed (default)

2-3 Access denied
Processor voltage J1F1-B 4-5 Standard voltage (default)

5-6 VRE enabled
CPU speed ratio J1F1-C See the "CPU Configuration (J1F1-C, D)" section below.
Host bus speed J1F1-D See the "CPU Configuration (J1F1-C, D)" section below.

Password clear (J1F1-A, Pins 1-3)

You should use this jumper only if the user password has been forgotten.
This jumper clears the system password. With the computer off, move the jumper from pins 1-2 to pins 2-3 and then turn the computer on. After five seconds, turn off the computer, and then return the jumper to the 1-2 position to restore normal operation.
The password function is always disabled if this jumper is in the 2-3 position.

CMOS clear (J1F1-A, Pins 4-6)

You should use this jumper whenever the system BIOS is updated.
This jumper allows CMOS settings to be reset to default values. Moving the jumper from the pins 4-5 to pins 5-6 and turning the system on enables this function. 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.

CMOS Setup access (J1F1-B, Pins 1-3)

Move this jumper from the 1-2 position to the 2-3 position to disable access to CMOS Setup utility.

CPU voltage (J1F1-B, Pins 4-6)

This jumper should not be changed unless changing to a new processor type.
This jumper block changes the output of the onboard voltage regulator. Pins 4-5 should be jumpered for processors that require standard voltage regulation. Pins 5-6 should be jumpered for processors that require the VRE specification.
NOTE: Some upgraded processors require a different setting. Check the processor documentation for the correct setting (Standard = 3.135-3.63V, VR= 3.3-3.465V, VRE = 3.465-3.63V).

CPU configuration (J1F1-C, D)

These jumper blocks allow motherboard switching between different speeds of the Pentium (R) processor. These jumpers also affect the PCI and ISA clock speeds, according to the following table:
CPU Freq.(MHz)Host Bus Freq.(MHz)Host Bus

J1F1-C
Host Bus

J1F1-D
CLK

Ratio
PCI Freq.(MHz)
200 66 1-2 and 5-6 1-2 and 5-6 6/2 33
180 60 2-3 and 4-5 1-2 and 5-6 6/2 30
166 66 1-2 and 5-6 2-3 and 5-6 5/2 33
150 60 2-3 and 4-5 2-3 and 5-6 5/2 30
133 66 1-2 and 5-6 2-3 and 4-5 4/2 33
120 60 2-3 and 4-5 2-3 and 4-5 4/2 30
100 66 1-2 and 5-6 1-2 and 4-5 3/2 33
90 60 2-3 and 4-5 1-2 and 4-5 3/2 30
75 50 2-3 and 5-6 1-2 and 4-5 3/2 25
reserved - 1-2 and 4-5 - - -

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