TI-81

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TI-81

The TI-81 is the first graphical calculator manufactured by Texas Instruments . When it was introduced in 1990, it was intended in particular for use in algebra and analysis classes. With its successor models, which have been further developed over the years ( TI-82 , TI-83 , TI-83 Plus and TI-84 Plus ), it has for the most part the basic functions and settings as well as the 96x64 pixel display introduced here for the first time (at Texas Instruments) together.

The heart of the TI-81 is a Zilog Z80 microprocessor, as used in most Texas Instruments graphing calculators. While the processor is usually at least 6 MHz and z. Sometimes it is clocked at up to 15 MHz , the TI-81 only runs at 2  MHz . The TI-81 has 2.4  KB of RAM .

The TI-81 user inputs are made in what is known as the Equation Operation System. This is comparable to the interfaces of the successor models.

The functional scope of this system includes the two-dimensional representation of parametric graphs (in addition to two-dimensional graphic standard representations), trigonometric calculations (in degrees or RAD), simple drawing skills, creation and handling of matrices up to 6x6 as well as programming in Texas Instruments' own programming language TI- BASIC .

As with its successor models, the TI-81 is powered by four AAA batteries and a CR1616 or CR1620 lithium battery as a backup battery, which stores programs and memory contents, for example, while the battery is being changed.

Texas Instruments also sells emulator software for PC that mimics the TI-81 and its computing functions.

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