Texas Instruments TI-83 PLUS - Manual (Page 616)

TI-83 Plus Memory and Variable Management 613
For: Sizes must be such that:
Archive Archive free size > variable size
UnArchive RAM free size > variable size
Note: If there is not enough space, unarchive or delete variables as necessary.
Be aware that when you unarchive a variable, not all the memory associated
with that variable in user data archive will be released since the system keeps
track of where the variable has been and where it is now in RAM.
Even if there appears to be enough free space, you may see a Garbage
Collection message when you attempt to archive a variable. Depending
on the usability of empty blocks in the user data archive, you may need
to unarchive existing variables to create more free space.
To archive or unarchive a list variable (L1) using the Archive/UnArchive
options from the MEMORY menu:
1. Press y L to display the
MEMORY
menu.
2. Select 5:Archive or 6:UnArchive to place the command in the edit
screen.