Toshiba TECRA S1 Maintenance Manual page 116

3 Diagnostic Programs
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4. Text Color
This test item is to check whether all 16 colors foreground and all 8 colors
background works normally in VGA text mode.
The bit4-6 of the attribute byte of a character defines 8 background colors (black,
blue, green, cyan, red, brown, magenta, and light gray), and the bit0-3 defines 16
foreground colors (dark gray, light blue, light green, light cyan, light red, light
magenta, yellow, and white besides the above 8 colors).
In the test, user is required to respond based on the instruction in the screen.
5. 80 * 25 Text Mode
This test item is to check whether 80*25 Text Mode works normally.
In the test, user is required to respond based on the instruction in the screen.
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3.8 Video
TECRA S1Maintenance Manual