The TI-81 was the first graphing calculator made by Texas Instruments. It was designed in 1990 for use in algebra and precalculus courses.

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View and Download Texas Instruments TI-81 manual book online. TI TI-81: User Guide. TI-81 calculator pdf manual download.

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The TI-81 was introduced in 1990. The handheld electronic calculator has a blue plastic case with a sliding cover that can also serve as a stand. It has an array of forty-one rectangular plastic keys, many of which can take on three meanings.

Texas Instruments is a major manufacturer. The following table compares general and technical information for a selection of common and uncommon Texas Instruments graphing calculators.

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Use the TI 84 Calculator Online for free graphing and scientific calculations. Perfect for students and professionals. Supports TI-84 Plus & CE models.

Use the TI 84 Calculator Online for free graphing and scientific calculations. Perfect for students and professionals. Supports TI-84 Plus & CE models.