HP-18C

A HP-18C

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 even though this model was not user programmable. The user did have a solver (another HP first) available, but only had about 1.5 K 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 Achilles' heel of this whole line; 18C, 19B, and 28C/S.

The HP-18C was introduced in 1986.

External links

HP-18C on MyCalcDB (database about 70's and 80's pocket calculators)
HP-18C at HP's Virtual Museum

Hewlett-Packard calculators

Graphing:	9g 28C 28S 38G 39G 39g+ 39gs 39gII 40G 40gs 48S 48SX 48G 48G+ 48GX 48gII 49G 49gII 49g+ 50g Prime Xpander

Scientific programmable:	10C 11C 15C 16C 19C 20S 21S 25 25C 29C 32S 32SII 33E 33C 33s 34C 35s 41C 41CV 41CX 42S 55 65 67 71B 95C 97 97S 9100A 9100B 9805

Scientific non-programmable:	6s 6s Solar 8s 9s 10s 10s+ 21 22S 27 27S 30s 31E 32E 35 45 46 91

Financial/business:	10B 10bII 10bII+ 12C 12c Platinum 12c Prestige 14B 17B 17BII 17bII+ 18C 19B 19BII 20b 22 27 30b 37E 38C 38E 70 80 81 92

Others:	01 10 CalcPad QuickCalc EasyCalc SmartCalc OfficeCalc PrintCalc