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Calculator Programs Disappeared After RAM Reset ​

In the rare case that your TI-84 Plus calculator crashes or the batteries are removed without the backup battery, the calculator will perform a “RAM Reset” which wipes all data in RAM.

This shouldn’t happen very often, but is known to occasionally occur, particularly when running advanced assembly programs. The RAM that is wiped may include programs, lists, formulas, and all variables — unless the programs are “archived” which stores them in ROM memory instead of RAM. ROM memory does not get reset under normal circumstances.

Restoring Your Programs ​

Depending on how the programs were loaded onto your device you may possibly have a backup copy stored in the ROM of the calculator. This is called a “Group”, which is similar to a ZIP file. To restore programs from a saved group:

  1. Turn your calculator on

  2. Access the UNGROUP menu by pressing 2nd, MEM, 8, →

  3. If you see one or more groups in this list, you can press ENTER to “unzip” the group and put all the contents back into the calculator’s RAM.

    If you happen to already have programs present with the same names, it will ask you if you want to overwrite them.

If you do not see a saved group in the list that you can restore from, you will need to connect your calculator to a computer and reinstall the programs from your computer. Instructions for doing this will be coming soon.

Creating a Backup Copy of Programs ​

You can create a backup copy of programs in your calculator ROM by creating a “group” which is similar to a ZIP file. It can contain multiple programs, however the programs cannot be executed from there, only stored until you’re ready to extract or “unzip” them.

Here’s how to create a group:

  1. Turn your calculator on

  2. Access the GROUP menu by pressing 2nd, MEM, 8

  3. Press ENTER to create a new group.

  4. Give the group a name such as BACKUP

  5. Select all the programs that you would like to add to the group by choosing option 3 and then using the arrow keys to scroll through the list. Press ENTER to mark each program that should be added to the group.

  6. Select DONE by pressing →, ENTER. Your group will be created and saved in ROM memory, and should not be lost when a RAM reset occurs.

You can follow the instructions above if you ever need to restore the programs from your saved group.