How do you make your
        calculations with a pencil?  This calculator uses same techniques,
        it makes HAND BASE calculation. So, it can work with unlimited
        digits. 
        
        I could write its add, subtract,
        multiply, divide, and power (just for positive integers) functions until
        now.
        Source code is here. It is under GPL
        license.
        Flash CS3 ActionScript 3.0  hand_base_calculator.zip
        You can copy, redistribute, modify source code without restrictions. 
        If you add a new function you may
        send it back here. ! Don't
        forget, it must be able to use unlimited digits.
         
        How it works?
Type
        the values into Field1 and Field2 and click a proper function
        button.