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The HP-65 is the first magnetic card-programmable handheld calculator. Introduced by Hewlett-Packard in 1974 at an MSRP of $795 [ 1 ] (equivalent to $4,912 in 2023) [ 2 ] , it featured nine storage registers and room for 100 keystroke instructions.
Introduced at US$395 (equivalent to $2,900 in 2023), [2] like HP's first scientific calculator, the desktop 9100A, it used reverse Polish notation (RPN) rather than what came to be called "algebraic" entry. The "35" in the calculator's name came from the number of keys. The original HP-35 was available from 1972 to 1975.
The finance-centric programmable calculator from the Voyager series introduced in the 1980s. The longest running product in the HP calculator line, it remains in production. Various models exist, the latest in 2008. HP-14B: 1988 Finance calculator with 12 digits precision and algebraic logic. It has 130 functions, 41 keys, and an LCD display ...
The Sinclair used a slightly altered Reverse Polish Notation method; lacking an enter key, the operation keys enter a number into the appropriate register and the calculation is performed. For example, (1+2) × 3 could be calculated as: C 1 + 2 + 3 × to give the result of 9.0000 00 ( 9.0000 × 10 0 , or 9).
The Executive impressed the engineers at Texas Instruments, who had used the same chip to produce a longer and wider calculator that was over three times as thick and a great deal more expensive. [10] In 1974, sales of the Executive exceeded £2.5 million, and Sinclair was producing 100,000 calculators each month, of which 55% were exported. [11]
The case features many design elements from 1970s HP calculators such as the ground-breaking HP-65, including a black case with silver-striped curved sides, slope-fronted keys, and gold and blue shift keys. The faceplate is metal, bonded to the plastic case. The key legends are printed, rather than the double-shot moulding used in the vintage ...
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