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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.
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.
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]
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 ...
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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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").
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 ...