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  2. TI SR-50 - Wikipedia

    en.wikipedia.org/wiki/TI_SR-50

    The SR-50 measured 5-3/4 inches long by 3-1/8 inches wide by 1-3/16 inches high (147 mm by 78 mm by 31 mm) and was powered by a rechargeable NiCad battery pack, built from three welded AA cells. It had 40 keys, and flat sliding switches for degrees / radians and on/off. "SR" stood for " slide rule." The SR-50 had a red LED display with a signed ...

  3. Battery terminal - Wikipedia

    en.wikipedia.org/wiki/Battery_terminal

    positive on left and negative on the right corner; negative on the left and positive on the right corner. Terminals can also be both on the long or short side of the battery, or diagonally opposed, or in the middle. Purchasing the wrong configuration may prevent battery cables from reaching the battery terminals.

  4. TI-82 - Wikipedia

    en.wikipedia.org/wiki/TI-82

    Power supply. 4 AAAs, 1 CR1616 or CR1620. The TI-82 is a graphing calculator made by Texas Instruments. The TI-82 was designed in 1993 as an upgraded version of and replacement for the TI-81. [1][2] It was the direct predecessor of the TI-83. It shares with the TI-85 a 6 MHz Zilog Z80 microprocessor. Like the TI-81, the TI-82 features a 96×64 ...

  5. TI-55 - Wikipedia

    en.wikipedia.org/wiki/TI-55

    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]

  6. TI-84 Plus series - Wikipedia

    en.wikipedia.org/wiki/TI-84_Plus_series

    The TI-84 Plus C Silver Edition was released in 2013 as the first Z80-based Texas Instruments graphing calculator with a color screen.It had a 320×240-pixel full-color screen, a modified version of the TI-84 Plus's 2.55MP operating system, a removable 1200 mAh rechargeable lithium-ion battery, and keystroke compatibility with existing math and programming tools. [6]

  7. TI-83 series - Wikipedia

    en.wikipedia.org/wiki/TI-83_series

    The TI-83 was the first calculator in the TI series to have built-in assembly language support. The TI-92, TI-85, and TI-82 were capable of running assembly language programs, but only after sending a specially constructed (hacked) memory backup. The support on the TI-83 could be accessed through a hidden feature of the calculator.

  8. Depth of discharge - Wikipedia

    en.wikipedia.org/wiki/Depth_of_discharge

    the fraction of the battery's capacity which is currently removed from the battery with regard to its (fully) charged state. For fully charged batteries, the depth of discharge is connected to the state of charge by the simple formula. D o D = 1 − S o C {\displaystyle \mathrm {DoD} =1-\mathrm {SoC} } The depth of discharge then is the ...

  9. Lead-acid battery - Wikipedia

    en.wikipedia.org/wiki/Lead-acid_battery

    Charge temperature interval. Min. −35°C, max. 45°C. The lead-acid battery is a type of rechargeable battery first invented in 1859 by French physicist Gaston Planté. It is the first type of rechargeable battery ever created. Compared to modern rechargeable batteries, lead-acid batteries have relatively low energy density.

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