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  2. HP-65 - Wikipedia

    en.wikipedia.org/wiki/HP-65

    HP-65 in original hard case with manuals, software "Standard Pac" of magnetic cards, soft leather case, and charger The HP-65 is the first magnetic card-programmable handheld calculator. Introduced by Hewlett-Packard in 1974 at an MSRP of $795 [ 1 ] (equivalent to $5,069 in 2024) [ 2 ] , it featured nine storage registers and room for 100 ...

  3. Sinclair Scientific - Wikipedia

    en.wikipedia.org/wiki/Sinclair_Scientific

    The Sinclair used a slightly altered Reverse Polish Notation method; lacking an enter key, the operation keys enter a number into the appropriate register and the calculation is performed. For example, (1+2) × 3 could be calculated as: C 1 + 2 + 3 × to give the result of 9.0000 00 ( 9.0000 × 10 0 , or 9).

  4. Sinclair Executive - Wikipedia

    en.wikipedia.org/wiki/Sinclair_Executive

    The Executive impressed the engineers at Texas Instruments, who had used the same chip to produce a longer and wider calculator that was over three times as thick and a great deal more expensive. [10] In 1974, sales of the Executive exceeded £2.5 million, and Sinclair was producing 100,000 calculators each month, of which 55% were exported. [11]

  5. Victor Technology - Wikipedia

    en.wikipedia.org/wiki/Victor_Technology

    The 6700 also includes a backspace key, tax keys, mark up key and grand total key. It sells for $37.99. [18] 9500 - The 9500 is a black 3.2 oz desktop calculator that uses LR1130 batteries. It has a selectable rounding switch and selectable decimal switch. This calculator also includes 3-key independent memory and is made with 50% recycled ...

  6. HP calculators - Wikipedia

    en.wikipedia.org/wiki/HP_calculators

    The finance-centric programmable calculator from the Voyager series introduced in the 1980s. The longest running product in the HP calculator line, it remains in production. Various models exist, the latest in 2008. HP-14B: 1988 Finance calculator with 12 digits precision and algebraic logic. It has 130 functions, 41 keys, and an LCD display ...

  7. HP-35 - Wikipedia

    en.wikipedia.org/wiki/HP-35

    Introduced at US$395 (equivalent to $2,900 in 2023), [2] like HP's first scientific calculator, the desktop 9100A, it used reverse Polish notation (RPN) rather than what came to be called "algebraic" entry. The "35" in the calculator's name came from the number of keys. The original HP-35 was available from 1972 to 1975.

  8. HP-45 - Wikipedia

    en.wikipedia.org/wiki/HP-45

    The HP-45 is the second scientific pocket calculator introduced by Hewlett-Packard, adding to the features of the HP-35.It was introduced in 1973 [1] with an MSRP of US$395 [2] (equivalent to $2,711 in 2023). [3]

  9. Curta - Wikipedia

    en.wikipedia.org/wiki/Curta

    A partially disassembled Curta calculator, showing the digit slides and the stepped drum behind them Curta Type I calculator, top view Curta Type I calculator, bottom view. The Curta is a hand-held mechanical calculator designed by Curt Herzstark. [1] It is known for its extremely compact design: a small cylinder that fits in the palm of the hand.

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