Introduction: On/Off, Contrast, Mode, And Editing Expressions; Turning The Calculator On; Adjusting The Display Contrast (Making The Screen Lighter Or Darker) - Texas Instruments TI-82 Keystroke Manual

TI-82 INTRODUCTION
On/Off, Contrast, Mode, and Editing
Expressions

TURNING THE CALCULATOR ON

When the ON button is pressed, you should see a blinking dark rectangle (called the cursor) in the
upper left-hand corner of the screen. The screen you are looking at is called the Home screen, where
basic computations are performed. If you do not see the blinking cursor, you may need to adjust the
display contrast. How that is done will be described next.
ADJUSTING THE DISPLAY CONTRAST (MAKING THE SCREEN LIGHTER OR
DARKER)
Even if your display is presently easy to view, you may find that under different lighting conditions you
may need to adjust the display contrast. Also, as the batteries in your calculator become weaker with
use, you will have to make occasional adjustments in display contrast.
If you wish to make the display darker, press the light blue 2nd key and then hold down the Up
Arrow (∆ ) key until the desired level of darkness is obtained. If you wish to make the display lighter,
press the light blue 2nd key and then hold down the Down Arrow (∇ ) key until the desired level of
darkness is obtained. As soon as you release the Up Arrow or Down Arrow key, the arrow keys no
longer affect contrast, and you must press the 2nd key again to make the arrow keys affect the
contrast.
Note that when the 2nd key is pressed, an arrow pointing upward appears inside the cursor to let
you know that the 2nd key has been pressed. (Why the arrow pointing upward denotes the 2nd key will
be explained a bit later.) The Up, Down, Left, and Right Arrow keys are the blue-gray keys located in
the upper right-hand portion of the keyboard. In many of the other uses we will have for them, they will
function in the same way as the arrow keys on a computer keyboard.
Experiment with the contrast setting a bit. You will find that when you press 2nd and hold down ∆
or press 2nd and hold down ∇ , a cursor with a number in it will appear in the upper right-hand corner
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