HP-22S
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File:Hewlett-Packard calculator, front (HP-22S), bought in 1989.jpg
Hewlett-Packard HP-22S (1989)
The HP-22S is an electronic calculator from the Hewlett-Packard company which is algebraic and scientific. This calculator is comparable to the HP-32S. A solver was included instead of programming. It had the same constraints as the 32S, lacking enough RAM for serious use. Functions available include TVM and unit conversions. Only single letter variable names are allowed.
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