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The TI-89 titanium is a much more advanced calculator; it includes a native Computer Algebra System (CAS) and can perform symbolic computations. It also has many additional mathematical features and functions not available in the catalog of functions in the TI-84+. If you want to learn about the different functions available on the TI-89, the manual is here: http://education.ti.com/downloads/guidebooks/graphing/89ti/TI89TitaniumGuidebook_Part2_EN.pdf
Also, if you are interested, you can download a software package for your TI graphing calculator to help you improve your score on the SAT test at www.calc-tech.com . It's called the SAT Operating System (SAT_OS) and can be used during the actual test to reduce time on math problems and improve the accuracy of your calculations.
The TI-83 is the precursor to the TI-83+ calculator, containing a similar and partially-compatible operating system, but lacking some of the additional features of the later calculator. The TI-83+ allows the same numerical evaluation of equations, graphing, statistical analysis, and numerical integration and differentiation as the TI-83. However, it adds Flash memory, which means both that the Operating System (OS) can be upgraded with new features, and that Applications, usually abbreviated Apps, can be stored in the Flash memory. Applications include GUIs/shells to run games, larger and more complex games than the TI-83 can handle, and study aids. In addition, the Flash memory can be used to store many more programs than fit in the TI-83's roughly 28KB or RAM.
I can't find the answers nor the TI-34II! Every time you go online to search who carries this, they show you every other calculator except the one you are looking for! This happens every friggin' year getting the kids school supplies together. Last year I had to find the TI-34 for my son, now its the 34II! What about my Sharp calculator from the 80's? It does the same stuff!
Well, ti83s don't have archive memory(ti83 plus does though) while ti84 has archive. Ti84s allow you to start a two digit label with a letter, while ti83 doesn't, which is why there is an ERR:VERSION when you try to transfer programs with labels like A4 from ti84 to ti83. Also, ti84s default connection cord is different from that of them ti83, and ti84 uses a mini-USB as ti83 uses a different one, the one labeled 'I/O' on the ti84.