640x200 Graphics Mode Check

To check your 640x200 graphics mode, press 6 then Enter. The screen displays three patterned squares against a contrasting background, as shown below.

640X200 GRAPHICS MODE CHECKIs the display correct (Y/H)?

I

If the patterns on your screen are clear and distinct, press Y and then Enter. If any pattern is not clear, first check the adjustment of your monitor, and then make sure that both ends of the cable are plugged in firmly. If a problem still exists, press N and Enter to display the error message.

Screen Paging Check

To check the screen paging of your monitor, press 7 and Enter. The video RAM on the color graphics adapter is divided into eight independent display pages. This test checks the eight pages by first filling all eight with a number corresponding to the page, and then displaying each page in turn. You see the following pattern for screen 0.

C-16 Performing System Diagnostics