Getting Started 66
To display the ABOUT screen, press ƒ 3:About from the Apps desktop. The ABOUT
screen displays the following information about your TI-89 Titanium:
Ê OS version
Ë Hardware version
Ì Unit ID (required to obtain certificates for installing purchased Apps). Similar to a serial
number. Write this number down and keep it in a safe place in case the calculator is ever
lost or stolen.
Í Apps certificate revision number (Cert. Rev.)
Î Product identifier (Product ID). Similar to a model number.
Note that your screen will be different than the one shown above.
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