This is a cool TI Emulator

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Virtual TI:
http://www.ticalc.org/archives/files/fileinfo/84/8442.html

This really comes in handy when I don't have my TI-89 around.
Make sure you download the ROM for your calculator too.
http://education.ti.com/uk/flash/freesoftware/freesoftware.html

http://scatcat.fhsu.edu/~becarlson/images/TI89.jpg