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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 Memory
é
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
28


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