Texas Instruments TI-83+ Introduction And Use Manual page 5

Screen Contrast and Battery Check 5
settings, then arrow to Exact/Approx and use the right and down arrows to change the setting to
3:Approximate. Press ¸ to complete the set-up. The sequence is shown below.
0.4 Screen Contrast and Battery Check
To increase the contrast, press and release the y key and hold down the } key. You will see
the contrast increasing. There will be a number in the upper-left corner of the screen which
increases from 0 (lightest) to 9 (darkest).
To decrease the contrast, press and release the y key and hold down the † key. You will see
the contrast decreasing. The number in the upper-left corner of the screen will decrease as you
hold. The lightest setting may appear as a blank screen. If this occurs, simply follow the
instructions for increasing the contrast, and your display will reappear.
When the batteries are low, the display begins to dim (especially during calculations) and you
must adjust to a higher contrast setting than you normally use. If you have to set the contrast
setting to 9, you will soon need to replace the four AAA batteries. With newer versions of the
operating system, your calculator will display a low-battery message to warn you when it is time
to change the batteries. After you change batteries, you will need to readjust your contrast as
explained above.
Note: It is important to turn off your calculator and change the batteries as soon as you see the
"low battery" message in order to avoid loss of your data or corruption of calculator memory.
Change batteries as quickly as possible. Failure to do so may result in the calculator resetting
memory to factory defaults (losing any data or options which have been set).
0.5 The TI-89 Titanium
On the TI-89 Titanium, most important functions which on other
calculators are accessed by keystrokes, are applications (Apps).
When the calculator is first turned on, you will be presented with a
graphical menu of these applications, as at right. Paging through the
screen to find the one you want can be tiresome and time consuming.
There is a way to customize this screen so that you only see those
applications you want to see.
Press ƒ. Press the right arrow key to expand menu selection
1:Edit Categories. You will be presented with a list of
possible categories. Press ª to select option 3:Math.