well then why did u say that the 83 was different and give the decimal value for $38. try doing stuff with the rst functions and see how many are the same from calc to calc >56d = 38h = 111000b, right? And the processor being the same doesn't >necessarily mean that all the calculators >use the same rst routines. Only that rst 0 is startup and rst 38h is interrupt >(in interrupt mode 1).