Compaq 386 manual Maintenance and Service Guide

Maintenance and Service Guide 8-23

The COMPAQ Enhanced Color Graphics Board has two banks of configuration switches (SW1 and SW2) as well as two jumpers (P1 and JP3) that must be positioned to allow the board to work properly with your computer system (Figure 8-18). The monitor you use with the COMPAQ Enhanced Color Graphics Board deter- mines the correct setting for one of the jumpers and one bank of configuration switches.

Another configuration switch bank setting determines whether the COMPAQ Enhanced Color Graphics Board is the only or primary video display controller board, or the secondary video display controller board in your computer. This configuration switch bank also determines the power-on mode and character format of the COMPAQ Enhanced Color Graphics Board when the computer is turned on or rebooted.

The following sections provide jumper and con- figuration switch locations and instructions on how to set them.

CAUTION

Use care when setting the configuration switches on the COMPAQ Enhanced Color Graphics Board. Many of the components on the board are sensitive to static electricity. Be sure that you are discharged of static electricity by briefly touching a metal object, such as the frame of the computer.

Also, the correct setting of the configura- tion switches is vital to the operation of the COMPAQ Enhanced Color Graphics Board. Be sure that you set them correctly for your computer system before installing the board.