Solution 11979: Purpose of the GarbageCollect Function on the TI-83 Plus Family, TI-84 Plus Family or TI-Nspire™ Handheld in TI-84 Plus Mode.
What does the GarbageCollect function do on the TI-83 Plus family, TI-84 Plus family or TI-Nspire handheld in TI-84 Plus mode?
The GarbageCollect function on the TI-83 Plus family, TI-84 Plus family or TI-Nspire handheld in TI-84 Plus mode allows the cleanup of unused archive memory.
It deletes unarchived variables from the user data archive and it rearranges the remaining variables into consecutive blocks. When a variable is unarchived, the amount of free Archive memory increases immediately, but the space is not actually available until after the next garbage collection.
To use the GarbageCollect function, follow the steps below:
1) Press [2ND]  to display the CATALOG menu.
2) Press [TAN] to "jump" to the "G" category of the CATALOG menu.
3) Press [ENTER] to paste the GargageCollect function onto the home screen.
4) Press [ENTER] to display the Garbage Collect prompt.
5) Press  to begin garbage collection.
Please Note: If the TI-83 Plus family or TI-84 Plus family calculator is locked up with the "GarbageCollecting" message displayed, refer to the Knowledge Base solution titled Troubleshooting a TI-83 Plus or TI-84 Plus Family Calculator that Displays Garbage Collecting... for More Than 20 Minutes.
Please see the TI-83 family and TI-84 Plus family guidebooks for additional information.
Please Note: TI-Nspire handheld in TI-84 Plus mode users may refer to the TI-84 Plus family guidebook.