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  2. Atari Calculator - Wikipedia

    en.wikipedia.org/wiki/Atari_Calculator

    In 2012, the Atari Calculator was highlighted in an article published in the ABBUC Magazin (Issue #111), which was published by the German-based, Atari Bit Byter User Club e.V., [19] and the styled Atari Calculator title was featured on the cover. [20] Cover design and fan art illustrations assisting the article authored by Oliver Rapp.

  3. HP-20S - Wikipedia

    en.wikipedia.org/wiki/HP-20S

    4.2 oz (120 g) Dimensions. 148×80×15mm. The HP-20S (F1890A) is an algebraic programmable scientific calculator produced by Hewlett-Packard from 1987 to 2000. A member of HP's Pioneer series, the 20S was a low cost model targeted at students, using the same hardware as the HP-10B business calculator. Compared with the higher-end 32S and 42S ...

  4. HP calculators - Wikipedia

    en.wikipedia.org/wiki/HP_calculators

    A basic scientific calculator, using infix notation, barely programmable and with no graphing capabilities. HP-21: 1975 Scaled-down HP-25. HP-21S: 1989 An algebraic, keystroke programming calculator. HP-22S: 1988 An algebraic scientific/statistics calculator. HP-25: 1975 Smaller programmable model with programs up to 49 steps.

  5. The rule of 25 for retirement: What it means and how to ... - AOL

    www.aol.com/finance/rule-25-retirement-means...

    Subtract that from your annual retirement expenses (40,000 – 20,0000 = $20,000). Finally, apply the rule of 25. So, if you expect to spend $40,000 in retirement each year and receive $20,000 in ...

  6. HP-25 - Wikipedia

    en.wikipedia.org/wiki/HP-25

    The HP-25 was a hand-held programmable scientific/engineering calculator made by Hewlett-Packard between early January 1975 and 1978. The HP-25 was introduced as a cheaper (US$195 MSRP) alternative to the ground-breaking HP-65. To reduce cost, the HP-25 omitted the HP-65's magnetic card reader, so it could only be programmed using the keyboard ...

  7. Reverse Polish notation - Wikipedia

    en.wikipedia.org/wiki/Reverse_Polish_notation

    Video: Keys pressed for calculating eight times six on a HP-32SII (employing RPN) from 1991. Reverse Polish notation (RPN), also known as reverse Łukasiewicz notation, Polish postfix notation or simply postfix notation, is a mathematical notation in which operators follow their operands, in contrast to prefix or Polish notation (PN), in which operators precede their operands.

  8. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    The first American-made pocket-sized calculator, the Bowmar 901B (popularly termed The Bowmar Brain), measuring 5.2 by 3.0 by 1.5 inches (132 mm × 76 mm × 38 mm), came out in the Autumn of 1971, with four functions and an eight-digit red LED display, for US$240, while in August 1972 the four-function Sinclair Executive became the first ...

  9. TI-30 - Wikipedia

    en.wikipedia.org/wiki/TI-30

    The original TI-30 was notable for its very low cost for the time, around US$25. This was much less than the retail prices of other scientific calculators of the era; for example, Hewlett-Packard's cheapest scientific calculator at the time was still well over $100. The Casio FX-20, another popular scientific calculator, sold for roughly double ...