Step 2Download TI-Connect so you can mannage data on your Calculator
This is the one I use and its great because you can backup your calculator.
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1. Rename the extension to be a .8x file. For instance, the filename foo.83l (a TI-83 list file) would be renamed to .8xl (a TI-83 Plus/84 Plus list file).
2. Copy the file from a TI-83 to a TI-83 Plus or TI-84 Plus. Once the files are on the TI-83 Plus or TI-84 Plus calculator, use TI Connect to copy the files to the computer. The files copied over will be in the proper .8x format.