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PRSTTY

       INTEGER FUNCTION  PRSTTY (UNITNO)
 C$    (Parse Internal - Terminal Type)
 C$    Given a FORTRAN unit number corresponding to an OPEN  file,
 C$    return as a function value  an integer giving the  terminal
 C$    type as required by the parsing package:
 C$
 C$    -1 = not a terminal,
 C$    0 = hardcopy or unknown,
 C$    1 = VT52,
 C$    2 = VT100,
 C$    3 = Televideo,
 C$    4 = Hazeltine-1500
 C$
 C$    In general, this routine will be system-dependent, and this
 C$    portable version simply returns -1.
 C$    (12-Apr-1991)