PC ONLY:
Here's an emulator called Wabbitemu, which uses a ROM image from one of our TI-84 calculators. Instructions:
1. Click here and download the zipped folder to your desktop.
2. Double click the folder called "Wabbitemu".
3. Extract all files to your desktop. (You can now delete the zipped folder.)
4. Open the folder and double click the Wabbitemu application icon.
5. Choose to Browse for ROM selection.
6. Choose the "TI_84_Plus_ROM" from the Wabbitemu folder.
7. When the calculator screen is displayed, choose the Calculator menu and select Enable skin. You are now ready to do some computing.
Other sources for the emulator and instructions for Windows/MAC?Android: