IBM PCjr

The problem with your IBM Color display may be that
the screen is roUing top-to-bottom or bottom-to-top
(vertical hold not properly adjusted).
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The IBM Personal Computer Basic
Version 01.20 Copyright IBM Corp. 1981
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IS THE SCREEN STABLE?
Go to Section 4, "Removal/Replacement and
Adjustments," and perform the IBM Color
Display Vertical Hold Adjustment. Then go to
page 3-500-27.
3-500-26 Display