This calculator served as the mechanism for learning HyperTalk. The operation of the calculator is similar to that of the HP RPN calculators. It can be used to learn the general principle of using RPN, or for general calculations. This version may be freely distributed for personal use only.
The round button in the lower left allows you to put a copy of the icon button above it in the home card so that it can be used to call up the calculator. Read the instructions displayed on the home card to position the button.
The calculator is somewhat sluggish on an SE or Plus, which is probably due to the heavy stack checking and manipulation required, and to the general nature of the HyperTalk language. It performs reasonably well on a Mac II or an SE with an accelerator board and math coprocessor.