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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 ...
Calculator, a portable electronic device used to perform calculations Slide rule , a graphical analog calculator, related to the nomogram Topics referred to by the same term
The Fuller calculator, sometimes called Fuller's cylindrical slide rule, is a cylindrical slide rule with a helical main scale taking 50 turns around the cylinder. This creates an instrument of considerable precision – it is equivalent to a traditional slide rule 25.40 metres (1,000 inches) long.
The kilopound per square inch (ksi) is a scaled unit derived from psi, equivalent to a thousand psi (1000 lbf/in 2). ksi are not widely used for gas pressures. They are mostly used in materials science, where the tensile strength of a material is measured as a large number of psi. [4] The conversion in SI units is 1 ksi = 6.895 MPa, or 1 MPa ...
8 KB of RAM (2.4 KB user accessible) 96×64 pixels 16×8 characters 6.75 x 3.125 x 1.0: No 1990 110 Allowed Allowed TI-82: Zilog Z80 @ 6 MHz 28 KB of RAM 96×64 pixels 16×8 characters 6.9 × 3.4 × 1.0 [4] No 1993 125 Allowed Allowed TI-83: Zilog Z80 @ 6 MHz 32 KB of RAM 96×64 pixels 16×8 characters 7.3 × 3.5 × 1.0 [4] No 1996 125 Allowed ...
Calculator, which includes the class: Graphing calculator; Scientific calculator; Programmable calculator; Accounting / Financial Calculator; Handheld game console; Portable media player; Portable data terminal; Handheld Smartphone, a class of mobile phone; Feature phone; Wearable computer; Single-board computer; Wireless sensor network ...
A pressure gauge reading in psi (red scale) and kPa (black scale) The SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N·m −2 or kg·m −1 ·s −2 ). This special name for the unit was added in 1971; before that, pressure in SI was expressed in units such as N·m −2 .
The "35" in the calculator's name came from the number of keys. The original HP-35 was available from 1972 to 1975. In 2007 HP announced the release of the "retro"-look HP 35s to commemorate the 35th anniversary of the launch of the original HP-35. It was priced at US$59.99. [3] The HP-35 was named an IEEE Milestone in 2009. [4]