IBM 3270 - IBM 3278 Display Station

The On/Off ( I / 0 ) switch is located near the screen's lower-left corner;
the screen brightness control
-d- and the contrast control () are
located near the screen's lower-right corner. The brightness and contrast controls
allow you
to adjust the display to a comfortable viewing level.
We will begin by turning on the display station. We will then proceed from
adjusting and interpreting the display image, through explaining the indicators,
and,
if your display uses a keyboard, to understanding all the keys on the
keyboard.
Figure 2-1. IBM 3278 Display Station
Chapter
2. Controls and Indicators 2-7