Key Tester for TI-84+ CE (and TI-84 KE)

Description

This utility highlights which key was most recently pressed, and the "hold" option keeps all previously pressed keys highlighted.

The "Normal" layout is what you would find on the front of your calculator
The "Keyboard" layout corresponds to the TI-84 KE, as shown in this thread:
https://www.cemetech.net/forum/viewtopic.php?p=289588

This tool allows you to easily test all the keys on your keypad.
There is no graceful exit, but pressing "ON" to quit also tests the "ON" button, so maybe that's a feature!

Disclaimer, this will mess with your window and graphscreen format settings, and turns off all of your plots, and also uses a lot of the alphabetical variables, List1, and MatrixA.