Solution 12078: Comparison Between the TI-89 Titanium and the TI-89.
What is different between the TI-89 Titanium and the TI-89?
The TI-89 Titanium is compatible, keystroke for keystroke, with the TI-89. Calculator files (Apps, data, programs, variables, etc.) can be transferred between these two models.
The TI-89 Titanium offers 3 times the memory of the TI-89 for Calculator Software Applications (Apps), 16 preloaded Apps (compared to 5 on the TI-89) including CellSheet™ App, NoteFolio™ App, and EE*Pro®, a built-in USB port for connectivity, and a USB cable with every unit.
For more information, please visit the product page for the TI-89 Titanium.