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TI-Nspire series
The TI-Nspire product line is a series of graphing calculators developed by Texas Instruments. This line currently includes the ''TI-Nspire'', ''TI-Nspire CAS'', ''TI-Nspire CX'' and ''TI-Nspire CX CAS''. There are models aimed for Chinese market, named as ''TI-Nspire CM-C'', ''TI-Nspire CX-C'', ''TI-Nspire CM-C CAS'', ''TI-Nspire CX-C CAS''. There is also software available for Windows and Mac OS X that act in similar ways to the calculators and allow the user to create compatible files. This software either requires a license or can only be used for a limited time. However, Texas Instruments also provides separate software that can be used for an unlimited time without a license but only allows file transfers and not emulation of the calculator. In 2010, Texas Instruments updated the calculators to the Touchpad versions which come with the Nspire or Nspire CAS computer software and support optional rechargeable batteries. In 2011, TI announced two new models of the TI-Nspire series: Nspire CX and Nspire CX CAS. The main new features are the color screen, rechargeable battery and thinner design.
==Handhelds==
The TI-Nspire series is completely different from the previous versions of the Texas Instruments's calculators. Because TI wanted the calculator to feel more familiar for new users, the TI-Nspire uses a user interface that is more similar to PCs than regular calculators. It also handles documents in a similar way to PCs. The TI-Nspire was the first to be released in two models; a numeric and CAS version. The numeric is slightly similar in features to the TI-84, except with a bigger and higher resolution screen and a full keyboard. The higher resolution screen makes it possible to draw graphs that are more detailed. The feature that the numeric lacks is the ability to solve algebraic equations such as indefinite integrals and derivatives. To fill in the gap of needing an algebraic calculator, Texas Instruments introduced the second model with the name TI-Nspire CAS, where CAS stands for Computer Algebra System. The CAS is designed for college and university students, giving them the feature of calculating many algebraic equations like the Voyage 200 and TI-89 (which the TI-Nspire was intended to replace). However, the Nspire does lack part of the ability of programming and installing additional apps that the previous models had, although a limited version of TI-BASIC is supported, along with Lua in later versions. C and assembly are only possible through the jailbreaking program Ndless.
Both the Nspire and Nspire CAS calculators have 16 MB of NAND Flash, 20 MB of SDRAM, and 512 KB of NOR Flash. The NAND Flash contains the operating system and saved documents and is not executable. The SDRAM likely contains an uncompressed version of the OS, and a copy of all active documents. The NOR Flash contains boot instructions for loading the operating system.
Much like all other TI graphing calculators, Nspire family models do not contain a backup battery, so when a battery is removed, the SDRAM content is deleted. This necessitates that the calculator load the operating system and file structure from the NAND Flash to the SDRAM, causing a longer loading time.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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