Casio Prizm Add-in File
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What is a G3A file?
Add-in file used by the Casio Prizm, a graphing calculator; often used for adding small games or handy utilities; written in C or low-level assembly language; can be packaged using the mkg3a program and then uploaded to the storage card on the Prizm.
After copying G3A files to the root directory of the Prizm's storage (by connecting to a PC via USB), you can then see the add-in from the main menu when you start the Prizm.