Introduced: 1981 and still in production. The calculator survived the hippo's digestive process as well as the washing that followed. The zoo keeper dropped the calculator and it was consumed by a hippopotamus. If this does not help, you may need to buy a new one. 3.1 remove batteries 3.2 take a metal paper clip and short the battery terminal in calculator together for ten seconds. Insert a straightened-out paper clip gently into the hole to reset the calculator. Tough construction: One HP-12C was used by a zoo keeper to calculate feed mixtures. There should be a reset hole under the battery cover.(The record so far is 22 years on the original set of batteries and that sample is still running!) And like all 10C series models, it has the advantage of running for months to years instead of hours on a set of batteries.A much larger manual with useful chapters on real estate, lending, investing, leasing, savings and bonds.Improved action of SST and BST features.Odd period calculations (allowing interest to accrue for some arbitrary amount of time before the first payment.).While low in product number, the HP-12C was high (for its time) in functionality making it a good replacement for the previous high end business model, the HP-38C. Perhaps it really does provide just the right functions in the right form factor at the right price. ![]() It has become part of the well-dressed business uniform - easily distinguished from cheap calculators due to its layout.Like all 10C series calculators, it has a nice solid built-like-a-brick feel that clamshell models can't quite match.The average business buyer, is perhaps, less inclined to read the spec sheets and more inclined to buy based on word of mouth.(Old business models out-selling new ones is not entirely unique to the HP-12C.) Business buyers are somewhat conservative. ![]() ![]() The HP-17B and 19B were algebraic calculators that were rather quickly replaced by BII versions with optional RPN.
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