How to Program TI-89 Titanium Graphing Calculator to Stay Awake

On the TI-89 Titanium graphing calculator, keeping the device “awake” can be accomplished by writing a simple program that runs an infinite loop. Here’s how you can create such a program:

1. Access the Program Editor: Turn on your TI-89 Titanium and press the APPS button. Select the ‘Program Editor’ and then ‘New’.
2. Name Your Program: When prompted, enter a name for your new program using the keypad and press ENTER.
3. Write the Program: Enter the following code to create an infinite loop:
   While 1
EndWhile

   • While 1 begins an infinite loop because the condition (1) always evaluates to true.
   • EndWhile marks the end of the loop. The absence of any operation within the loop ensures the calculator does little to no processing, thereby keeping it awake without draining the battery excessively quickly.
4. Save the Program: Press the 2ND button followed by the QUIT button (ESC) to exit the editor and save your program.
5. Run the Program: Press APPS, go to ‘Var-Link’, find your program in the list, and press ENTER to run it.

The TI-89 Titanium will now run the program indefinitely, preventing it from automatically shutting off. To stop the program and allow the calculator to turn off as normal, simply press the ON button to interrupt the program.

Running a program like this continuously will consume more battery power than usual, so it’s a good idea to have the calculator plugged in if possible, or be prepared to replace the batteries more frequently. As with any device, allowing the automatic shutdown feature to function normally during periods of inactivity is generally the best practice for conserving battery life.