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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. 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 ...

  9. HP-15C - Wikipedia

    en.wikipedia.org/wiki/HP-15C

    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. Although out of production, its popularity has led to high prices on the used market. The HP-15C was a replacement for the HP-34C.