Toshiba TECRA S1 ユーザーズマニュアル

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3  Diagnostic Programs 
 
3.8 Video 
42 
TECRA S1Maintenance Manual 
 
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.