COMMON /CRATIO/ FDTAB(MAXFILES), FILTAB(FILTABSIZE), EXTCHR(NCHARS),
   INTCHR(NCHARS)
   INTEGER FDTAB%# POINTERS TO FILE BLOCKS
   INTEGER FILTAB%# FILE BLOCKS
   CHARACTER EXTCHR%# EXTERNAL REPRESENTATION OF CHARACTERS
   CHARACTER INTCHR%# INTERNAL (ASCII) REPRESENTATION OF CHARACTERS
