Epson 386SX - Manual (Page 207)

Color Graphics Adapter and CRT Check
Use this option to check the operation of a color graphics
adapter (or MGA, EGA, or VGA) card and display. This test
includes several checks that allow you to identify particular
problems related to the color display. You can select the
individual checks from this menu:
COLOR GRAPHICS ADAPTER AND CRT CHECK MENU
1 - Color graphics adapter check
2 - Attribute check
3 - Character set check
4 - 40-column character set check
5 - 320X200 graphics mode check
6 - 640X200 graphics mode check
7 - Screen paging check
8 - Light pen check
9 - Color video check
10 - Sync check
11 - Run all above checks
0 - Exit
If an error occurs during any of these tests, record the error code
and message, or print them out. Then contact your Epson dealer
or service center.
When you finish testing the device, select 0 to exit.
Color Graphics Adapter Check
To check the color graphics adapter, select 1. The program
checks the video RAM (display memory) on the display adapter
card by writing test data to memory, and then reading it back
and comparing it to the written data. The program also tests the
video enable signal of the display controller chip.
Performing System Diagnostics C-15