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The TI-84 (no plus) is not featured on TI's website, so I don't think it exists anymore. However all the TI-84 series are the same, just differ in amounts of ROM and RAM. The calculator pictured is the TI-84 Plus, which I will review.
Essentially, Texas Instruments TI-84+ is one of the best calculators I have ever owned. Having upgraded from a non-graphical calculator I was slightly apprehensive about a steep learning curve. However I managed to get straight into using the calculator. It does everything I need it to do and is accepted in most examinations.
One great feature is APPS. You can download them free from TI's website and basically they are applications that help you to do certain mathematical functions. For example, I just downloaded one that solves simultaneous equations for you.
It will set you back about $120.
Basically if you need a graphics calculator, the TI-84+ is great. Just make sure you get a USB cable so you can use the APPS feature. If you want more memory get the TI-84+ Silver Edition.
Features Electronically upgradeable graphing handheld allows you to have the most ... more
up-to-date functionality and software applications (Apps). 2.5 times the processor speed of the TI-83 Plus. 480 KB FLASH ROM memory for data archive and storage of Apps. 24KB of available RAM memory. USB port for computer connectivity, unit-to-unit communication with TI-84 Plus and TI-84 Plus Silver Edition graphing handhelds, and more. I/O port for communication with other TI products. Internal Clock with date and time display. TI Connectivity Cable included. TI Connectivity Cable and TI Connect software allow information to be transferred to and from a computer and printed or stored on disk.