Texas Instruments TI-83 Plus Manual Book page 105

Checking the Amount of Flash Application Free Space
1. From the home screen, press .
2. Select
Mem Mgmt/Del.
The CellSheet™ application requires at least 49,152 bytes of
ARC FREE (Flash) to load the application.
For more information about memory and memory management,
refer to the TI83 Plus manual.
TI-83 Plus CellSheet™ Application Page 105