- HP-18C
The HP-18C was a
Hewlett-Packard businesscalculator which was quickly followed by the very similar but greatly improvedHP-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.External links
* [http://mycalcdb.free.fr/main.php?l=0&id=830 HP-18C] on [http://mycalcdb.free.fr MyCalcDB] (database about 70's and 80's pocket calculators)
* [http://www.hp.com/hpinfo/abouthp/histnfacts/museum/personalsystems/0044/index.html HP-18C at HP's Virtual Museum]
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