Description: from website Wabbitemu is the most complete Z80 TI emulator to date, although it is the most recent of the TI Z80 emulators. It emulates the TI-73, TI-82, TI-83, TI-83 Plus, TI-83 Plus Silver Edition, TI-84 Plus, TI-84 Plus Silver Edition, TI-85, and TI-86. It was initially developed by Spencer Putt and James Montelongo and development by Chris Shappell and Spencer is currently active.
It's the open source alternative to TI SmartView which can cost upwards of $150 ;).
Download Wabbitemu Portable 1.6.2 Dev Test 1 English
2 MB Download / 3 MB Installed
1.6.2 DT1 - March 3, 2012: Initial Release
In order to use this, you'll need to have the TI operating system on as a ROM or 8XU file (to be converted through Wabbitemu). Don't have one? Don't worry; you can download some of the the operating systems for free from Texas Instruments:
Download the TI-73 OS
Download the TI-83+ OS
Download the TI-84+ OS
The others weren't available through the Texas Instruments website, but Google might be able to help you find them.
And when you do pick one, I recommend saving the ROM into WabbitemuPortable\Data folder, but that's just me.