There were at least eight hardware revisions of the HP-12C since 1981 (including one special issue). The 1977 October edition of the HP Journal contains an article by Roy Martin, the inventor of the simple method of operation used in HP financial calculators, which describes, in detail, the mathematics and functionality built by William Kahan and Roy Martin that is still used today. Its popularity has endured despite a relatively simple but iterative process such as amortizing the interest over the life of a loan, a calculation that modern spreadsheets can complete almost instantly, can take over a minute with the HP-12C. Due to its simple operation for key financial calculations, the calculator long ago became the de facto standard among financial professionals. The HP-12C is HP's longest and best-selling product, in continual production since its introduction in 1981. Critics claim that its 1980s technology is antiquated, but proponents point out that it is still the de facto and de jure in high finance.
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with newer revisions moving to an ARM processor running a software emulator of the original Nut processor.
There have been multiple revisions over the years. It's HP's longest and best-selling product and is considered the de facto standard among financial professionals. as part of the HP Voyager series, introduced in 1981. The HP-12C is a financial calculator made by Hewlett-Packard (HP) and its successor HP Inc.
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