Texas Instruments TI-83-Plus - Graphing and Drawing - What’s the difference?

TI-83 Plus GeoMaster™ Application Page 83
Error in Xmit
This problem is usually associated with the unit-to-unit cable and
its connection between the TI

83 Plus calculators. Make sure the
cable is firmly inserted in the I/O port of each calculator.
If you continue to get this error, please contact TI

Cares
™
Customer Support.
Invalid Signature or Certificate
Either this calculator does not have a certificate to run the
application, or electrical interference caused a link to fail. Try to
install the application again. If you continue to receive this error,
contact TI

Cares
Customer Support.
Other Errors
See pages B-6 through B-10 in the TI

83 Plus
manual for
information about the specific error or contact TI

Cares
Customer Support.