PA0465 Console Scientific Calculator Program

                                                              
                 Valid operator symbols:                      
                                                              
                 Addition       : +                           
                 Subtraction    : -                           
                 Multiplication : x, X, *                     
                 Division       : /                           
                 Exponentiation : ^                           
                                                              
  To be recognized as a valid operator your symbol must be    
  located in the middle of the three columns between operand  
  fields. Interrupting under a valid operator field will cause
  the operator symbols to be displayed in the order above.