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Replacement battery packs are no longer available, leaving existing HP-35 calculators to rely on AC power, or their users to rebuild the battery packs themselves using available cells. An external battery charger was available, and the calculator could also run from the charger, with or without batteries installed.
Casio. Type. Quartz. Display. Digital. Introduced. June 1989 [ 1] The Casio F-91W is a digital watch manufactured by Japanese electronics company Casio. Introduced in June 1989 [ 1] as a successor of the F-87W, [ 2] it is popular for its low price and long battery life.
HP-19B, introduced on 4 January 1988, along with the HP-17B, HP-27S and the HP-28S, and replaced by the HP-19BII (F1639A) in January 1990, [2] was a simplified Hewlett Packard business model calculator, like the 17B. It had a clamshell design, like the HP-18C, HP-28C and 28S.
A switched-mode power supply ( SMPS ), also called switching-mode power supply, switch-mode power supply, switched power supply, or simply switcher, is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Like other power supplies, an SMPS transfers power from a DC or AC source (often mains ...
Power supply. 4.5 V (3× AAA battery) Weight. 0.25 kg (0.55 lb) Dimensions. 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 ...
TI SR-50. Printed circuit board. Data code 035: 3rd week 1975. The SR-50 was Texas Instruments ' first scientific pocket calculator with trigonometric and logarithm functions. It enhanced their earlier SR-10 and SR-11 calculators, introduced in 1973, which had featured scientific notation, squares, square root, and reciprocals, but had no trig ...
TI-83 series. The TI-83 series is a series of graphing calculators manufactured by Texas Instruments . The original TI-83 is itself an upgraded version of the TI-82. [1] Released in 1996, it was one of the most popular graphing calculators for students. In addition to the functions present on normal scientific calculators, the TI-83 includes ...
HP-15C. The HP-15C is a high-end scientific pocket calculator with a root-solver and numerical integration. A member of Hewlett-Packard Voyager series of programmable calculators, it was produced between 1982 and 1989. The calculator is able to handle complex numbers and matrix operations.