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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.

  3. HP-20S - Wikipedia

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

    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.

  4. HP-16C - Wikipedia

    en.wikipedia.org/wiki/HP-16C

    HP has never made another calculator specifically for programmers, [2] but has incorporated many of the HP-16C's functions in later scientific and graphing calculators, for example the HP-42S (1988) and its successors. Like many other vintage HP calculators, the HP-16C is now highly sought-after by collectors. [14]

  5. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    Made in Japan, this was also the first calculator to use an LED display, the first hand-held calculator to use a single integrated circuit (then proclaimed as a "calculator on a chip"), the Mostek MK6010, and the first electronic calculator to run off replaceable batteries. Using four AA-size cells the LE-120A measures 4.9 by 2.8 by 0.9 inches ...

  6. Sinclair Scientific - Wikipedia

    en.wikipedia.org/wiki/Sinclair_Scientific

    It cost US$395 (about £165), but despite the price, over 300,000 were sold in the three and a half years for which it was produced. [1] [2] From 1971, Texas Instruments had been making available the building block for a simple calculator on a single chip [3] and the TMS0803 chipset appeared in a number of Sinclair calculators.

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  8. Grand Grimoire - Wikipedia

    en.wikipedia.org/wiki/Grand_Grimoire

    The first book contains instructions for summoning a demon and for the construction of tools with which to force the demon to do one's bidding. The second book is divided further into two parts: the Sanctum Regnum ("Holy Kingdom") and Secrets, de L'Art Magique du Grand Grimoire ("Secrets, of the magic art of the Grand Grimoire").

  9. Sinclair Sovereign - Wikipedia

    en.wikipedia.org/wiki/Sinclair_Sovereign

    The Sovereign was one of the last calculators produced during Sinclair's foray into the calculator market that had started with the Sinclair Executive in September 1972. [1] The Executive had retailed for £80 when introduced, but in little over a year it was possible to purchase a Sinclair calculator for £20 and by November 1976 a model was ...