Texas Instruments TI-73 Software Manual page 45

If this does not correct the problem, try a different
TI-GRAPH LINK cable and reboot your computer. If you continue
to get this error, please contact TI-Caresé Customer Support for
assistance.
Memory is Full
This download error appears when the TI-73 contains one to four
applications that occupy the available 64K of space. To make
room for another application, you must delete one from the
TI-73. Before deleting an application, you can back it up to your
computer so that you can reload it later as necessary.
Syntax Error
ignores the last transaction and displays the last results.
QUIT
displays the screen with the error highlighted. Make any
GOTO
necessary correction and press b.
Singular Mat
A singular matrix (determinant=0) is not valid as an argument
-1
for .
Matrices for the TI-73 Page 45