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Original question:
I recently got this TI-83 Plus and wanted to play around with it. Along the line I got this app called, "ION". It was needed to run one of the games. But whenever I ran prgmION, which I was supposed to do, I said, ERR:INVALID, or ERR:SYNTAX. Can someone please help me with this! I was really excited to play MARIO on a calculator.
