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The Cambridge was extremely small for a calculator of the time: [1] it weighed less than 3.5 ounces (99 g) and measured 50 by 111 by 28 millimetres (2.0 in × 4.4 in × 1.1 in). Power was supplied by four AAA batteries. [5] The use of cheap components was an important contributor to the unit's cost.
A simple arithmetic calculator was first included with Windows 1.0. [5]In Windows 3.0, a scientific mode was added, which included exponents and roots, logarithms, factorial-based functions, trigonometry (supports radian, degree and gradians angles), base conversions (2, 8, 10, 16), logic operations, statistical functions such as single variable statistics and linear regression.
50 by 111 by 19 millimetres (1.97 in × 4.37 in × 0.75 in) (Scientific) 73 by 155 by 34 millimetres (2.9 in × 6.1 in × 1.3 in) (Scientific Programmable) The Sinclair Scientific was a 12-function, pocket-sized scientific calculator introduced in 1974, dramatically undercutting in price other calculators available at the time.
The first American-made pocket-sized calculator, the Bowmar 901B (popularly termed The Bowmar Brain), measuring 5.2 by 3.0 by 1.5 inches (132 mm × 76 mm × 38 mm), came out in the Autumn of 1971, with four functions and an eight-digit red LED display, for US$240, while in August 1972 the four-function Sinclair Executive became the first ...
The HP-35, introduced on February 1, 1972, was Hewlett-Packard's first pocket calculator and the world's first handheld scientific calculator. [7] Like some of HP's desktop calculators it used RPN. Introduced at US$395, the HP-35 was available from 1972 to 1975.
Internally, the calculator was organized around a serial processor chipset dual sourced under contract from Mostek and American MicroSystems Inc (pictured), processing Decimal floating point numbers with 10 digit mantissa and 2 digit exponent, stored in 14 nibble (56 bit) numbers as BCD including two nibbles for the signs.
The Sharp PC-1403 was a small scientific calculator and pocket computer manufactured by Sharp. It was the successor of the Sharp PC-1401 , and had better display, more RAM and better system software.
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