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The HP-18C was a Hewlett-Packard business calculator which was quickly followed by the very similar but greatly improved HP-19B. The HP-18C was HP's first RPL-based calculator internally,〔 even though this was not visible on user-level in this non user-programmable model. The user did have a solver (another HP first) available, but only had about 1.5 KB of continuous memory 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 shortcoming of this whole line; 18C, 19B, and 28C/S. The HP-18C was introduced in June 1986.〔 ==See also== * HP calculators * List of Hewlett-Packard products: Pocket calculators 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「HP-18C」の詳細全文を読む スポンサード リンク
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