Keyboard Layout, Menu Navigation, Home Screen Basics 1. The TI-89 has a yellow 2nd key, a purple Alpha key, and a green Diamond key.
Many keys have three meanings and some have four.
Actually, there are other keys with 4 meanings. Generally, the TI-89 will show the home screen when it is turned on. Across the very top of the home screen appears a toolbar menu with options labeled F1 through F6. Press the corresponding key from the very top row of keys, F1 through F5, or 2nd F1 for F6. Two options will appear.