Starting with the HP-25, this produced many programs, and the successor calculators to the HP-25 used very similar programming structures and functions, allowing programs to be easily ported, from the HP-25 to the HP-33E, to the HP-15, to the HP-32 and HP-42, and finally to the HP-33S. Over the years, many people developed programs for the programmable calculators and disseminated them. It was a back-up computer (the fourth) on the later Apollo missions.Īfter that, successive models included more features, better battery life, continuous memory, greater connectivity and more accessories for the connected models. The latter two were programmable, the HP-65 also being able to store and retrieve programs on magnetic cards. So successful was the calculator that additional models were released: the HP-45, HP-55 and HP-65. ![]() It used Reverse Polish Notation (RPN) to simplify operation and allow the operator to see the intermediate results, and it took the scientific and engineering communities by storm! This was nicknamed 'the electronic slide-rule' at the time, and it was designed to have all the functions of a slide-rule, plus additional capabilities, and to fit in a shirt pocket. ![]() ![]() In the early 1970s, HP built a small and exceptionally powerful calculator of engineers and surveyors: the HP-35A.
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