HP 39gs User Manual page 52

To box zoom
2-12
Y-Zoom In:
Y-Zoom In
Now un-zoom.
Y-Zoom Out:
Y-Zoom Out
Zoom Square:
Square
The Box Zoom option lets you draw a box around the
area you want to zoom in on by selecting the endpoints
of one diagonal of the zoom rectangle.
1. If necessary, press
labels.
2. Press and select Box...
3. Position the cursor on one corner of the rectangle.
Press .
4. Use the cursor keys
( , etc.) to drag to
the opposite corner.
5. Press to zoom in
on the boxed area.
to turn on the menu-key
Aplets and their views