Texas Instruments PLUS TI-89 - Manual (Page 31)

14 Chapter 2: Operating the Calculator
02OPER.DOC TI-89/TI-92 Plus: Operating the TI-89/TI-92 Plus (English) Susan Gullord Revised: 02/23/01 1:06 PM Printed: 02/23/01 2:11 PM Page 14 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 Memory
é 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 APD é (Automatic Power Down é ) 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