Texas Instruments TI89 Developer Guide - Page 260

218 Chapter 18: TI FLASH Studio 18.4.6. Preparing the Application for Site Testing In normal calculator usage, an application is installed in a calculator by downloading it from a PC or another calculator via the link cable. When the app is received, it is examined for a valid TI digital signature by the Operating System loader. All Flash apps to be distributed must be digitally signed by TI before they will be accepted by the Operating System. Since all apps must be signed, an app build must go through TI before it can be loaded in the normal way. Since signing is 1) an external process for developers, 2) is limited, and 3) has turnaround time associated with it, a single calculator debugging technique is available to facilitate code development. The debugging technique used with the TI FLASH Studio circumvents this restriction, but it only works on the simulator, not a real calculator. Once an application has become well developed, some developers may need to perform testing on their calculator. The Educational and Professional tools allow the developer to download an application to their developer calculator. To support this need, TI may issue certificate for the testing calculator and set the developer up so that they can sign the app instead of TI. In this situation, the app will only run on the selected calculator. 18.4.6.1. Educational and Professional Developers TI will assign the developer a Developer ID, generate a digital key and create a unit certificate for the calculator. The key is contained in one file: .key. The unit certificate file will be named: .89q or .9xq depending on whether it is for a TI-89 or TI-92 Plus calculator. Typically all this information can be emailed to the developer. After receiving the key file and the unit certificate, you are ready to sign your apps for site testing. The procedure is as follows: 1. Make sure the .key file is in the same directory as the TI FLASH Studio executable (TI Flash Studio.exe). Default directory is C:/Programs/TI Flash Studio. 2. When you load and build the app, a directory with the same name as your key file is created in the C:/Programs/TI Flash Studio/Projects// directory. This directory has the signed application (.9xk file). Please note that an unsigned app is also created in the C:/Programs/TI Flash Studio/Projects/ directory. TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001