ext63     headr
     ARITF     equ  700   
     SETFP     equ  831   LOADER PLUGS MANTISSA WIDTH INTO B
     DOSUB     equ  1206  LOADER PLUGS SUBSCRIPT ROUTINE ADDRESS HERE
     QFUNCT    equ  1327  GO TO FUNCTION SELECTOR
     ARITI     equ  1530  LOADER PUTS INTEGER SIZE IN B
     AGMWM     equ  1696