How to Group and Ungroup Programs on the TI-84 Plus
You can group variables residing in RAM memory and store the group in archive memory of your TI-84 Plus for safekeeping. Then, if the RAM on your calculator is cleared, you can ungroup the variables and they will be restored in their original state. It's a great idea to group the programs stored in the RAM of your calculator.
Here are the steps to group and ungroup programs:
Press [2nd][+] to access the GROUP UNGROUP menu.
See the first screen.
Press [ENTER] to create a new group.
Enter a name for the group and press [ENTER].
See the second and third screens.
Pressing  enables you to select programs from a list.
Use the up- and down-arrow keys and press [ENTER] to select programs you wish to group.
Notice the small square next to the programs you have selected. See the first screen.
To select DONE, press
You have successfully created a group of programs. If the RAM on your calculator is cleared, you now have a backup of your programs. See the second screen.
To ungroup, press
to see a list of groups. See the third screen. Ungrouping will not delete the original group. The group remains in archived memory until you decide to delete the group.
Use the up- and down-arrow keys and press [ENTER] to select the group you wish to ungroup.
If you ungroup a program that already exists in the RAM, you will be given the option to rename or overwrite the program.