HP 98780 CE Handbook page 18

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5-4 98780 Diagnostics
A
Alpha Test
Press A; the alphanumeric display is on.
Press continue; the alphanumeric display is off (blank display).
Press continue; the alphanumeric display is on and the alternate cursor (back arrow) is displayed.
Press continue; the character set is displayed. The standard ASCII character set is shown below.
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Press continue to select another test.
G
Grid
Press G; the grid shown below is displayed.
Press continue to select another test.

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