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The HP-65 introduced the "tall", trapezoid-shaped keys that would become iconic for many generations of HP calculators. Each of the keys had up to four functions. In addition to the "normal function" printed on the key's face, a "gold" function printed on the case above the key and a "blue" function printed on the slanted front surface of the ...
The calculator had a four-register stack (x, y, z and t). The stack was represented in the operating manuals with the t register at the top, followed by the registers z, y, and x. The "enter" key pushed the displayed value (x) up the stack. Any binary operation popped the bottom two registers and pushed the result.
The EL-8 was much smaller, small enough to be used in one's hand: 164 mm (6.46 in) long, 102 mm (4.02 in) wide, and 70 mm (2.76 in) thick, and weighing 0.72 kg (1.59 lb) with batteries. [6] Although it was still too bulky to easily fit in a pocket, [ 1 ] it was an important step toward the development of the pocket calculator.
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 ...
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 ...
Earlier calculators needed a key, or key combination, for every available function. The HP-67 had three shift keys (gold "f", blue "g" and black "h" prefix keys); the competing Texas Instruments calculators had two (2nd and INV) and close to 50 keys (the TI-59 had 45). Hewlett-Packard were constrained by their one byte only instruction format.
Since it lacked expandability, and lacked any real I/O ability, both key features of the HP-41 series, it was marketed as an HP-15C replacement. The 42S, however, has a much smaller form factor than the 41, and features many more built-in functions, such as a matrix editor, complex number support, an equation solver , user-defined menus, and ...
The 10C was a basic scientific programmable calculator. While a useful general purpose RPN calculator, the HP-11C offered twice as much for only a slight increase in price. Designed to be an introductory calculator, it was still costly compared to the competition, and many looking at an HP would just step up to the better HP-11C.
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