PA0465 Console Scientific Calculator Program

                                                                
  There is a free form expression evaluation field on line 9. To
  make use of this feature you simply have to type in the       
  expression you wish to evaluate and interrupt anywhere on the 
  line. The answer will appear in the normal answer field, and  
  it will also be included in the stack. Some basic functions   
  are supported which presently include the basic trig, log,    
  and exponentiation functions. A few constants are also        
  swpported including pi, e, and a few physical constants.