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| | HP CALCULATOR HISTORY - Models |
 | | The early HP handheld calculators were all known simply by a model number; HP-35, HP-80, HP-45, HP-65, HP-90, HP-25 and so on. |
 | | The first HP calculator with a letter as well as a number was the HP-25C - this was a version of the HP-25 with "Continuous Memory", in other words the contents of memory were not lost when the calculator was turned off. |
 | | After the HP-94 series, HP went back to just a "C", with the HP-18C and the HP-28C, but these were replaced by the HP-19B and the HP-28S, where the "B" and "S" stood for Business and Scientific. |
| www.xnumber.com /xnumber/WMJ_models.htm (1096 words) |
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