Apple PowerBook (Duo 270C) - Manual (Page 24)

Starting the tour
1. Roll the trackball to move the arrow pointer around on
the screen.
Place the index finger of your dominant hand on the trackball
and the thumb of the same hand on the lower trackball
button. Don’t press either button yet.
Watch the arrow on the screen while you roll the trackball,
and notice that the arrow moves in the same direction that
you roll the trackball.
You may need to roll the trackball around for a few seconds to
“break in” the mechanism so it works smoothly.
8 Chapter 1: Setting Up Your PowerBook Duo