This is IntCalc, an RPN calculator tool originally based on the HP-16C but with many additional capabilities. Detailed documentation can be found in the "IntCalc help" file (in both MSWord and MacWrite format).
IntCalc is shareware and is still the original low price of $10. The response to it so far has been more than I ever expected. I'm not getting rich (and never expected to), but it is extremely gratifying to know that I've produced something that people find useful enough to voluntarily pay for. I value each of my customers. (The address to send the payment can be found in the About box and in the help file.)
The only major change for version 1.2 is the addition of trigonometric and logarithmic functions. They will show up in FLT mode on all those buttons that formerly were just greyed out, integer-only buttons. The available functions include sine, cosine, and tangent, as well as their corresponding arc functions and hyperbolic functions; logarithms in base 10 and base e; e raised to any power; and a button to enter the value of pi.
For the trig functions, angles can be expressed in either degrees, radians, or grads (360 degrees = 2¹ radians = 400 grads). The button for the current angular mode (on the upper left of the calculator) will have a heavy border. When you switch between modes, numbers displayed in the calculator are not automatically converted. You can use the four conversion buttons on the bottom left to manually convert among the three units. Some conversions, e.g. degrees to grads, must be done in two steps, that is, degrees to radians then radians to grads.
A note about programming and the new Òdouble-dutyÓ buttons: When you enter programming mode, these buttons will remain in whatever state they were in. If you need to program from the other set (e.g., the double-duty buttons are showing their trig functions, but you want to program some bit-shifting functions), there is a button at the top right of the programming window that will say either Òuse INTÓ or Òuse FLTÓ. Clicking on this button will toggle the double-duty buttons between the integer set of functions and the trig/log set of functions. When you exit from programming mode, the buttons will automatically revert to their original state.
