IBM 5150 Hardware Maintenance Manual page 80

This test is used to verify that the 80 x 25 Alpha mode logic is
functioning on the Color/Graphics Monitor Adapter. The
border for the 80 x 25 character test should be black. Press
rl
t:j
and
e
B
(Enter). The following should appear on
your Display:
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IS THE SCREEN CORRECT? (YIN) -
~
­
, I '
IS THE BORDER BLACK AND ARE THE CHARACTERS
PRESENT AND COMPLETE?
NO
Replace your Color/Graphics Monitor Adapter. See
Section 3, "Removal/Replacement."
YES
500-9