Dell OptiPlex GX1 - Manual (Page 152)

Diagnostic Video Tests: Dell OptiPlex GX1 Small-Form-Factor System User's Guide
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Character Attributes Subtest (40 x 25)
The 40-column x 25-line character attributes subtest displays four lines of text in 40-column by 25-line
(double-wide) text mode that demonstrate normal-intensity video, reverse video, intensified video, and
blinking video. Figure 5 shows an example of the 40-column x 25-line character attributes subtest screen.
Figure 5. 40-Column x 25-Line Character Attributes Subtest Screen