Miscellaneous Jumper settings (Continued)

Jumper

Jumper

Function

number

Setting

J 3 0

1 - 4

Selects external battery

 

2-3*

Selects the system board battery

 

3 - 4

Discharges CMOS memory (this resets the SETUP values to

 

 

their factory defaults)

*Factory setting

**Jumpers JB and JE must be set to the same position to enable or disable the hard disk drive controller

***Default setting depends on the type of factory-installed microprocessor

Microprocessor type jumper settings

Microprocessor type Installed

J11*

J13*

486DX. 484DX2. or DX4

1-2

 

1-2,3-4

486SX

Off

 

2-3

487SX or Pentium OverDrive

2-3

 

1-2.3-4

 

 

 

 

SX2/50

1-2

or Off

2-3

 

 

 

 

Default setting depends on the type of factory-installed microprocessor

Microprocessor voltage jumper settings (I)

Microprocessor Voltage

J31

J33 (3)

5 volt

1-2 and 3-4 (2)

-

3.3 or 3.45 volt

5-6 and 7-8

1-2

3.6 Volt

5-6and7-8

2-3

 

 

 

(1)To determine the voltage of your microprocessor, see page 3-24.

(2)Default setting

(3)The setting of J33 does not matter if you are using a 5 Volt microprocessor.

Built-in VGA controller jumper settings

Function

J14

J15

Enable built-h VGA control&r

On*

On*

 

 

 

Disable built-in VGA controller

Off

Off

 

 

 

* Default setting

Installing and Removing Options

3-7