There are four calculators in the 49 series of HP graphing calculators. These calculators have both algebraic and RPN entry modes, and can perform numeric and symbolic calculations using the built-in Computer Algebra System (CAS), which is an improved ALG48 and Erable combination from the HP-48 series.
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... The 49 series allows the user to update the ROM to gain enhanced features or bug fixes ... Official ROM updates are released by HP ...
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