/sys$common/syshlp/helplib.hlb FORTRAN, Intrinsic Procedures, CHAR  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  CHAR (integer)

  A function that returns the character associated with the ASCII
  value specified by the argument.  The argument must be BYTE,
  LOGICAL*1, LOGICAL*2, LOGICAL*4, INTEGER*1, INTEGER*2, or INTEGER*4
  in data type.  The result must be CHARACTER in type.  The input
  value must be in the range 0 to 255.