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I am interested in acquiring and preserving old HP calculators,
associated peripherals, manuals and other documentation.
If you have any of this equipment or know where to find it, please send me an e-mail. The HP 21 handheld calculator is a second generation scientific calculator (the first generation being the HP-35) with an LED display. It was introduced in 1975 and discontinued in 1978.
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The following advertisement appeared in the August 1975 issue of
IEEE Spectrum magazine.
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Click here for the Home page.
Click here for the Wanted page.
Updated March 18, 2006
![[Large]](hp21a-aug75.gif){kind=link}
![[Large]](hp21b-aug75.gif){kind=link}