The HP-80
Introduced on the 1st of February 1973, discontinued begin 1977.
The HP-80 was Hewlett Packard's second handheld calculator. This calculator was designed for business rather than scientific/engineering calculations. In addition to having different functions, it was designed with a different philosophy. Whereas the HP-35 was designed for technical/mathematical users, the HP-80 was designed to be a problem solver that didn't require its users to know the formulas needed. So the user could simply enter the known values for his business problem and calculates the answer by a single keystroke.
The ENTER button is relabeled to a SAVE button and this is the first calculator using a shift key.
This early model has a metal trim strip above the power switch. See the small picture below. For later models this metal strip is replaced by a painted trim line.
Manuals
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Quick reference guide (Dutch) |
Additional information
A lot of interesting information about this nice business calculator can be found in the next HP patents and article in the HP Journal.
| US 3863060 | General purpose calculator with capability for performing interdisciplinary business calculations. |
| US 3946218 | General purpose calculator with capability for performing yield-to-maturity of a bond calculation. |
| US 3955074 | General purpose calculator having keys with more than one function assigned thereto. |
| A Pocket Sized Answer Machine for Business and Finance. |
Visit my HP-80 inside page to find out how this Classic model is build.
HP-80 related links: