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The HP-18C was a Hewlett-Packard business calculator which was quickly followed by the very similiar but greatly improved HP-19B . The HP-18C was HP's first RPL-based calculator although programming was not allowed to the user. The user did have a solver (another HP first) available, but only had about 1.5 K of RAM available to store equations. The calculator had many functions buried in a menu structure. The clamshell design was fairly robust, but the battery door is the Achilles' heel of this whole line; 18C, 19B, and 28C/S.
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