Texas Instruments TI-80 User Manual - Page 28

Turning the TI-80 On and Off 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. Turning the Calculator On Turning the Calculator Off APD™ (Automatic Power Down™) Batteries 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. 1-2 Operating the TI-80