SUBROUTINE GRAPHITE_OR_TUBE_CONV(ConvType, DataIo, SubrLabel, ReturnedValue)
*
begin condition
pre:
post:
end condition
$insert logical

equ valid$         to 0    ;* successful
equ invalid_msg$   to 1    ;* bad data       -   print error message window
equ invalid_conv$  to 2    ;* bad conversion -          "         "
equ invalid_nomsg$ to 3    ;* bad but do not print the error message window

status() = Valid$
begin case
   case ConvType = 'ICONV'
        ReturnedValue = DataIo
   case ConvType = 'OCONV'
        begin case
           case DataIo = 'G'
              ReturnedValue = 'Graphite'
           case DataIo = 'S'
              ReturnedValue = 'Susceptor'
           case DataIo = 'T'
              ReturnedValue = 'Tube'
              
           case 1
              ReturnedValue = DataIo
         end case
   case otherwise$
        status() = invalid_msg$
end case
return