1-2 Operating the TI-80
To turn the TI.80 on, press the ´ key. To turn it off, press and release y, and
then press ®. After about five minutes without any activity, the APD™
(Automatic Power Down™) feature turns the TI.80 off automatically.
Press ´ to turn the TI-80 on.
¦If you pressed y ® to turn the calculator off, the
display shows the Home screen as it was when you last
used it, and errors are cleared.
¦If APD turned the calculator off, the display returns to the
same screen or editor in which you left it. See “APD
(Automatic Power Down)” below.
Press and release 2, and then press ® to turn the TI-80
off.
¦Any error condition is cleared.
¦All settings and memory contents are retained by the
Constant Memoryé feature.
To prolong the life of the batteries, APD turns the TI-80 off
automatically after several minutes without any activity. When
you press ´, the calculator shows the same screen or editor
in which you left it.
¦If an error message was displayed when APD turned the
TI-80 off, the error is cleared, and the display returns to a
blank line on the Home screen.
¦If a menu was displayed, the display returns to the screen
or editor from which you called the menu.
All settings and memory contents are retained by the Constant
Memory feature.
Note: APD does not occur if a calculation or program is in
progress, unless the program is paused.
The TI-80 uses two CR2032 lithium batteries. To replace the
batteries without losing any information stored in memory,
follow the directions in Appendix B.
Turning the TI-80 On and Off
Turning the
Calculator On
Turning the
Calculator Off
APD™
(Automatic
Power Down™)
Batteries