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  2. Comparison of Texas Instruments graphing calculators

    en.wikipedia.org/wiki/Comparison_of_Texas...

    4.7 x 8.2 x 1.5 Yes 1995/1996 200 (TI-92) Not Allowed Not Allowed TI-92 Plus: Motorola 68000 @ 12 MHz 256 KB of RAM (188 KB user accessible), 384 KB of Flash ROM 240×128 pixels 4.7 × 8.2 × 1.5 [4] Yes 1998 179.99 Not Allowed Not Allowed Voyage 200: Motorola 68000 @ 12 MHz 256 KB of RAM (188 KB user accessible), 2.7 MB of Flash ROM

  3. IBM Naval Ordnance Research Calculator - Wikipedia

    en.wikipedia.org/wiki/IBM_Naval_Ordnance...

    The IBM Naval Ordnance Research Calculator (NORC) was a one-of-a-kind first-generation (vacuum tube) computer built by IBM for the United States Navy's Bureau of Ordnance. It went into service in December 1954 [ 1 ] and was likely the most powerful computer at the time. [ 2 ]

  4. 68–95–99.7 rule - Wikipedia

    en.wikipedia.org/wiki/68–95–99.7_rule

    In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively.

  5. File:Half-age-plus-seven-relationship-rule.svg - Wikipedia

    en.wikipedia.org/wiki/File:Half-age-plus-seven...

    Self-made graphic, with layout partially influenced by the PD image en:image:Half Plus Seven Graph 2.JPG uploaded to en.wikipedia on 5 May 2008 by en:User:Ccdelt. Text was converted to paths to improve display (unconverted, the file would have been only 5kb). Author: AnonMoos: Other versions: File:Half Your Age Plus Seven Graph.JPG

  6. Scientific calculator - Wikipedia

    en.wikipedia.org/wiki/Scientific_calculator

    Casio fx-77, a solar-powered digital calculator from the 1980s using a single-line LCD. A scientific calculator is an electronic calculator, either desktop or handheld, designed to perform calculations using basic (addition, subtraction, multiplication, division) and complex (trigonometric, hyperbolic, etc.) mathematical operations and functions.

  7. Casio V.P.A.M. calculators - Wikipedia

    en.wikipedia.org/wiki/Casio_V.P.A.M._calculators

    Changes to S-series calculators include: 2-line LCD display featuring 5×6-dot matrix cells top line and 7-segment LCD bottom line that had been used in Casio fx-4500P programmable calculators (used 5×7-dot matrix cells).

  8. Pinwheel calculator - Wikipedia

    en.wikipedia.org/wiki/Pinwheel_calculator

    A pinwheel calculator is a class of mechanical calculator described as early as 1685, and popular in the 19th and 20th century, calculating via wheels whose number of teeth were adjustable. These wheels, also called pinwheels, could be set by using a side lever which could expose anywhere from 0 to 9 teeth, and therefore when coupled to a ...

  9. Programmable calculator - Wikipedia

    en.wikipedia.org/wiki/Programmable_calculator

    Originally, calculator programming had to be done in the calculator's own command language, but as calculator hackers discovered ways to bypass the main interface of the calculators and write assembly language programs, calculator companies (particularly Texas Instruments) began to support native-mode programming on their calculator hardware ...

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