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HP-48

The HP-48 is a series of electronic graphing calculators produced by Hewlett-Packard from 1990 until 2003. The calculators in this series were the HP-48S, HP-48SX, HP-48G, HP-48GX, and HP-48G+. The HP-48G II is not really a member of this series, but rather much more closely related to the HP-49G and HP-49G+. The 48SX and 48GX were expandable via special RAM and ROM cards that could be purchased, whereas the rest were not.

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