Jumper Settings

If you change your computer’s configuration or need to alter the way it operates, you may need to change a jumper setting inside the computer.

A jumper is a small electrical connector that controls one of the computer’s functions. The jumper settings in your computer are preset at the factory; however, you can control certain features by changing the standard settings as follows:

tl Enable or disable the built-in mouse connector

Cl Set your monitor type to monochrome or color

Ll Change the amount of base memory

tl Enable or disable the power-on password function

U Enable or disable the built-in VGA display adapter

tl Change the operation of the input/output ready signal.

If you increase your computer’s memory by installing memory modules, you must set a group of jumpers to indicate the amount of memory you now have.

If you have the 25 MHz model and you had your 80486SX microprocessor chip replaced with a 80487SX chip, you must set jumpers JP1, JP2, and JP3 to indicate a new microprocessor is installed. (Because the 50 MHz model has a built-in math coprocessor, these jumpers are not used.)

If you need to change any jumper settings, locate the jumpers on the main system board, shown on page 6-3.

6-4Installing and Removing Options