The HP 28C: HP’s First Graphing Calculator

Photo of the HP 28C, Hewlett-Packard's first graphing calculator (opened). Enlarge
Photo of the back of the HP 28C (closed). Enlarge
Photo of the front of the HP 28C graphing calculator while closed. Enlarge
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Date: 1987

The 28C was Hewlett-Packard’s first graphing calculator and the first handheld calculator from any company to be able to solve algebraic equations.

Tags: 1980s • 1987 • Calculator • portable

( C ) HPCA

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