IBM 5155 - Vertical Size Adjustment

Vertical Size Adjustment
This adjustment is required only if the character size on
your mM Color Display is incorrect.
Vertical Size
Control
1 Set the Power switch on the system unit to Off.
(If the expansion unit is attached, also set its
Power switch to Off.)
2 Set the display's Power control to On.
3 Turn the Brightness and Contrast controls fully
clockwise.
4 Turn the Vertical Size control fully
counterclockwise. A black area appears across
the top and bottom of the screen.
Color
Display 3-35