"The HP 49G series are Hewlett-Packard (HP) manufactured graphing calculators. They are the successors of the HP-48 series, one of the best-selling calculator ranges among engineers, scientists, and students.
There are now four calculators in the 49 series of HP graphing calculators. These calculators all 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.
The 49 series is often compared to the Texas Instruments' TI-89 series. Speed of calculation varies between the systems — generally the TI-89 series CAS (based on Texas Instruments' Derive engine) outperforms the HP-49G series CAS in areas such as simultaneous equation solving, integration and symbolic matrix manipulation; however, the 49 series is generally faster in other areas, such as 3D plot generation, series expansion and numeric matrix manipulation." (Wikipedia)
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Hewlett-Packard HP49 - BIOS (TOSEC-v2006-03-18)
Hewlett-Packard HP49 - Various (TOSEC-v2006-03-18)