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TI-55 II Calculator, the second variant, with an LCD display. The TI-55 is a programmable calculator first manufactured by Texas Instruments in 1977. It has an LED display, [1] and weighs 6.4 ounces (180 grams). It is programmable to hold up to 32 key-codes that allow the user to repeat simple calculations with different values. [2]
55: 14.5-31.3: Frequency 55 Toric, Hydrasoft Sphere, Hydrasoft Sphere Thin, Hydrasoft Aphakic, Hydrasoft Aphakic Thin, Hydrasoft Toric, Hydrasoft Toric Thin Vilfilcon A: 55: 16: Focus 1-2 Week Softcolors, Focus Monthly Softcolors, Focus Toric, Focus Progressives, Soft 55, Soft 55 EW
Usually, an interface module, such as the Casio FA-1, was used to connect the calculator to an ordinary cassette recorder, and digital data were encoded as frequency-shift keyed audio signals. [10] Sharp and Hewlett-Packard also sold dedicated micro-or mini-cassette recorders that connected directly to the calculator. These set-ups, while being ...
The calculator uses the proprietary HP Nut processor produced in a bulk CMOS process and featured continuous memory, whereby the contents of memory are preserved while the calculator is turned off. [13] Though commonplace now, this was still notable in the early 1980s, and is the origin of the "C" in the model name.
17.9×7.9×2.8 cm (7.05×3.11×1.1 inch) The HP 48 is a series of graphing calculators designed and produced by Hewlett-Packard from 1990 until 2003. [ 1 ] The series includes the HP 48S , HP 48SX , HP 48G , HP 48GX , and HP 48G+ , the G models being expanded and improved versions of the S models.
A Battery: Eveready 742: 1.5 V: Metal tabs H: 101.6 L: 63.5 W: 63.5 Used to provide power to the filament of a vacuum tube. B Battery: Eveready 762-S: 45 V: Threaded posts H: 146 L: 104.8 W: 63.5 Used to supply plate voltage in vintage vacuum tube equipment. Origin of the term B+ for plate voltage power supplies.
The calculator was code-named Wizard, [4] which is the first known use of a code name for a calculator. It also contained an Easter egg that allowed users to access a not-especially accurate stopwatch mode. [5] [6] An accurate version of the stopwatch mode was officially featured in the 1975 successor of the HP-45, the HP-55.
Casio Cassiopeia was the brand name of a PDA manufactured by Casio.It used Windows CE (later versions running Windows PocketPC/Windows Mobile) as the Operating system.Casio was one of the first manufacturers of PDAs, developing at the beginning small pocket-sized computers with keyboards and grayscale displays and subsequently moving to smaller units in response to customer demand.