
HP-35
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High Quality Content by WIKIPEDIA articles! The HP-35 was Hewlett-Packard's first pocket calculator and the world's first scientific pocket calculator. Like some of HP's desktop calculators it used reverse Polish notation. Introduced at US$395, the HP-35 was available from 1972 to 1975. Market studies at the time had shown no market for pocket sized calculators. In about 1970, HP co-founder Bill Hewlett challenged his co-workers to create a "shirt-pocket sized HP-9100". Thus, the first ~12 HP-35 portable calculators were made as a "hack" by and for other engineers at HP. It is rumored[citation...
High Quality Content by WIKIPEDIA articles! The HP-35 was Hewlett-Packard's first pocket calculator and the world's first scientific pocket calculator. Like some of HP's desktop calculators it used reverse Polish notation. Introduced at US$395, the HP-35 was available from 1972 to 1975. Market studies at the time had shown no market for pocket sized calculators. In about 1970, HP co-founder Bill Hewlett challenged his co-workers to create a "shirt-pocket sized HP-9100". Thus, the first ~12 HP-35 portable calculators were made as a "hack" by and for other engineers at HP. It is rumored[citation needed] that the development engineer got carried away and implemented a full suite of scientific functions to satisfy requests from his co-workers. When these prototypes proved popular, HP decided to turn the HP-35 into a commercial product. The HP-35 was the first calculator with a full suite of trigonometric and transcendental functions. In the first months orders were exceeding HP's expectations as to the entire market size, which was 10,000 units per year. Before the HP-35, the only practical portable devices for performing trigonometric and exponential functions were slide rules.