Texas Instruments TI-73 Explorer User Manual page 21

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This error occurs when the TI-83 Plus does not have sufficient
memory for the application. In order to make room for another
application, you must delete an application or archived variables
from the TI-83 Plus. Before you delete an application from the
TI-83 Plus, you can save it on your computer using TI™ Connect
or TI-GRAPH LINK™ software for the TI-83 Plus. You can reload
it to the TI-83 Plus later using TI Connect software or
TI-GRAPH LINK software.
Memory Error
This error occurs when the TI-73 does not have sufficient
memory for the application. In order to make room for another
application, you must delete an application from the TI-73.
Before you delete an application from the TI-73, you can save it
on your computer using TI Connect software or TI-GRAPH LINK
software for the TI-73. You can reload it to the TI-73 later using
TI Connect software or TI-GRAPH LINK software.
Other Errors
See Appendix B in the TI-73 manual or pages B-6 through B-10
in the TI-83 Plus manual for information about the specific error.
TI-73 / TI-83 Plus Logic Ladder Page 21