IBM PCjr Manual page 208

12
6-66 SOCDTest
Your screen is filled with zeros (0).
Press
Another screen appears. Continue
to press the Insert key, each time
displaying the next screen, until the
screen is filled with sevens (7).
Did you reach the screen filled with
sevens?
YES - Press
r
and go to Step 13.
NO - Have your IBM PCyr
serviced. See "Service
Information" in this
section.