Turning The Calculator Off; Second Functions For Keys-Notation; Mode - Texas Instruments TI-82 Keystroke Manual

2 TI-82 Introduction
of the Home screen as long as you hold down the Up Arrow or Down Arrow key. Try to adjust the
contrast, and as you do, be looking in the upper right-hand corner of the screen for the contrast
number. This number indicates how dark, on a scale of 0 to 9, you have made your screen, with 9
representing the darkest possible contrast setting. As the batteries in your calculator become weaker,
the contrast setting usually needs to be increased to provide the same level of contrast you may have
obtained at a lower setting with fresh batteries. When you need to set the contrast setting to 8 or 9 on a
regular basis to see the display clearly, it is time to change batteries.
When is the contrast set appropriately? To some extent it is a matter of personal preference, but
there are some contrast qualities which most people find suitable. The screen is composed of tiny
squares, called pixels, which darken to form the cursor, numbers, letters, etc., on the screen. Most
people find that the contrast is set about right when the cursor is clearly visible and you can see that it
is composed of 7 rows and 5 columns of pixels. You should also just barely be able to see where the
other pixels are on the screen, but they should by no means be dark, just barely visible if you look
closely.

TURNING THE CALCULATOR OFF

Pressing the 2nd key before pressing the ON key activates the ON key's second function, which is
printed in light blue print above the ON key. Notice the word OFF written on the keyboard above the ON
key. Thus, pressing the 2nd key and then the ON key turns the calculator off.
If you forget to turn the calculator off, it will turn itself off after a few minutes of non-use, using
the Automatic Power Down (APD™) feature. Pressing the ON key turns the calculator back on, and
the screen will appear exactly as it was before the (APD™) feature turned the calculator off.
SECOND FUNCTIONS FOR KEYS—NOTATION
To simplify matters in the future when referring to second functions served by keys, this Keystroke
Guide will simply show 2nd followed by the name of the second function, enclosed in brackets. For
example the keystroke sequence for turning the calculator off will be denoted 2nd [OFF]. Thus, the word
in brackets is not on the key itself, but it is written above the key in light blue print as the key's second
function. This is why, when you press the 2nd key, the arrow pointing upward appears inside the
cursor. It is to remind you to look for the light blue print above a key, rather than what is written on
the key, to determine what that key will do when you press it.

MODE

Before doing some basic computations, it would be a good idea to check the mode settings on the
calculator which determine how results are displayed. Press the MODE key. The display should appear
as shown at the top of the next page.