A linux based TI emulator exists that uses the wxWidgets code libraries.
Compile instructions:
sudo apt-get install subversion
svn checkout http://wxwabbitemu.googlecode.com/svn/trunk/ wxwabbitemu-read-only
cd wxwabbitemu-read-only/src
sudo apt-get install wx2.8-headers wx-common libwxgtk2.8-dev
chmod +x ./build_wx
./build_wx
To run it, type, in the same directory:
./wxwabbitemu
You'll need a licensed ROM for this to work - google that one.
Legally - Texas Instruments themselves distribute the TI83 variant with their SDK
wget http://education.ti.com/calculators/downloads/US/Software/Download/en/177/6560/83psdk_setup.exe
TI83Plus.clc for the TI-83+, TI83ps.clc for the TI-83+ Silver Edition and TI73.clc for the TI-73
N.B. copy and rename as .rom for the application to work correctly.
Links:
- See this forum entry as to the advantages/disadvantages of using these ROMs.
- See this wiki for operating instructions - e.g. F12 to turn on

... or there is a Flash based remake
