14 Chapter 2: Operating the Calculator
02OPER.DOC TI
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89/TI
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92Plus: O
p
eratingthe TI
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89/TI
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92Plus (English) SusanGullord Revised:02/23/01 1:06 PM Printed:02/23/01 2:11 PM Page14 of 44
Press ´.
¦ If you turned the unit off by pressing 2®
, the TI-89 / TI-92 Plus
returns to the Home screen.
¦ If you turned the unit off by pressing ¥®or if the unit turned
itself off through APD, the TI-89 / TI-92 Plus returns to whichever
application you used last.
You can use either of the following keys to turn off the TI-89 / TI-92 Plus.
Press: Description
2®
(press 2
and then
press ®)
Settings and memory contents are retained by the
Constant Memoryé feature. However:
¦ You cannot use 2®if an error message is
displayed.
¦ When you turn the TI-89 / TI-92 Plus on again, it
always displays the Home screen (regardless of
the last application you used).
¥®
(press ¥
and then
press ®)
Similar to 2®except:
¦ You can use ¥®if an error message is
displayed.
¦ When you turn the TI-89 / TI-92 Plus on again, it
will be exactly as you left it.
After several minutes without any activity, the TI-89 / TI-92 Plus turns
itself off automatically. This feature is called APD.
When you press ´, the TI-89 / TI-92 Plus will be exactly as you left it.
¦ The display, cursor, and any error conditions are exactly as you
left them.
¦ All settings and memory contents are retained.
APD does not occur if a calculation or program is in progress, unless
the program is paused.
The TI-89 uses four AAA alkaline batteries and a back-up lithium
battery. The TI-92 Plus uses four AA alkaline batteries and also has a
back-up lithium battery. To replace the batteries in either calculator
without losing any information stored in memory, follow the
directions in Appendix C.
Turning the TI-89 / TI-92 Plus On and Off
You can turn the TI-89 / TI-92 Plus on and off manually by using
the ´and 2®(or ¥®) keys. To prolong battery life,
the APDé (Automatic Power Downé) feature lets the
TI-89 / TI-92 Plus turn itself off automatically.
Turning the
TI-89 / TI-92 Plus
On
Turning the
TI-89 / TI-92 Plus Off
Note:
®
is the second
function of the
´
key.
APD (Automatic
Power Down)
Batteries