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A small sliding switch was used to change between "run" and "program" mode. The HP-25 used a 10-digit red LED display and was the first calculator to introduce the "engineering" display option, a denormalized mantissa/exponent format where the exponent is always a multiple of 3 to match the common SI prefixes, e.g. mega, kilo, milli, micro, nano.
A tri-state type DIP switch can be in one of three positions (+, 0, −) which allows more codes than a binary DIP switch. For example, 8 pole tri-state DIP switches offer 6,561 (3 8) combinations/codes compared to 8 pole binary switches' 256 (2 8) combinations/codes. This makes them especially suitable for encoding devices such as a remote ...
It has a selectable decimal switch and a selectable rounding switch, it also has 3 key independent memory, a grand total function and a backspace key. It also has cost/sell/margin keys. It costs $23.99. [13] 1200-4 - The 1200-4 is a black professional desktop calculator with a 12-digit tilted LCD display and is made out of 50% recycled plastic ...
Skinny dual in-line package (SDIP or SPDIP [6]) – Sometimes used to refer to a "narrow" 0.300 in. (or 300 mil) wide DIP, normally when clarification is needed e.g. for DIP with 24 pins or more, which usually come in "wide" 0.600 in wide DIP package. An example of a typical proper full spec for a "narrow" DIP package would be 300 mil body ...
The switch was held to the left to access the functions to the left above the keys, and to the right to get the functions to the right above the keys. In the centre position it would enter the numbers on the keys. [4] It used normal algebraic logic, as opposed to the reverse Polish notation employed on some Sinclair calculators. [4]
Four constants are printed on the calculator case for easy reference. For converting to and from base 10 logarithms and natural logarithms, the natural logarithm of 10 (2.30259) and e (2.71828) are printed on the case. π (3.14159) and 57.2958 (180 / π) are also on the case for trigonometry calculations. There was not enough internal memory to ...
This is a list of calculators produced by Clive Sinclair's company Sinclair Radionics: Sinclair Cambridge. Sinclair Cambridge Scientific; Sinclair Cambridge Memory;
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.