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. It is very similar to the HP19BII, but missing RPN logic.
This unit has a wonderful true leather carrying bag (pictured)
HP 17BII original - USED
50.00 € *
HP17bII - black - used
75.00 € *