IBM RT PC 10 Hardware Maintenance And Service page 312

Vertical Size 2
1. Be sure the display is attached to an Enhanced Graphics Adapter and
the mode switches are set for enhanced mode. If needed, see Section 9.
2. Set the power switch on the system unit and display to On.
3. Turn the Brightness control fully clockwise.
4. Adjust the Vertical Size 2 control until the black areas are equal on all
sides, then return the Brightness control to the desired setting.
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Vertical
Size 2
Displays 11-13