IBM Personal Computer AT Manual To Operations page 303

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4
Did all of the following happen with the keyboard
on your screen?
• The corresponding characters appeared in
each block on the screen.
• The three squares in the upper right corner
of the screen intensified.
• The three status lights on your keyboard
came on.
PRESS EACH KEY, HOLD FOR TYPEMATIC TEST
IF OK PRESS "Y THEN ENTER"
IF NOT OK PRESS "N THEN ENTER"
or
PRESS EACH KEY, HOLD FOR TYPEMATIC TEST
IF OK PRESS "Y THEN ENTER"
IF NOT OK PRESS "N THEN ENTER"
YES
Go to Step 5.
NO Have your keyboard serviced.
Test 300-5