* f77 can't write to a file opened with F 
      SUBROUTINE OPENFILE(ILUN,CHFILE,IOS)
      CHARACTER*(*) CHFILE

      OPEN(ILUN,FILE=CHFILE,IOSTAT=IOS)

      END
      SUBROUTINE CLOSEFILE(ILUN,IOS)

      CLOSE(ILUN,IOSTAT=IOS)

      END
      SUBROUTINE WRITECH(ILUN,CHLINE)
      CHARACTER*(*) CHLINE

      WRITE(ILUN,*)CHLINE

      END
                 
** For PAW :
****************************************************************
* F has no common blocks
      SUBROUTINE PAWCOM()
      PARAMETER (NWPAWC = 1 000 000)
      DIMENSION HMEMOR(NWPAWC)
      COMMON /PAWC/ HMEMOR

      CALL HLIMIT(NWPAWC)
      
      END
** For MIDAS Data :
****************************************************************
      SUBROUTINE READWORD(ILUN,IDATA,IOS)
      INTEGER*4 IWORD,IDATA
      CHARACTER*1 CDATA(4)
      EQUIVALENCE(CDATA,IWORD)
      NBYTE = 4
      
      CALL READCH(ILUN,CDATA,NBYTE,IOS)      
      IDATA = IWORD
      
      END
****************************************************************
      SUBROUTINE READHWORD(ILUN,IDATA,IOS)
      INTEGER*2 IHWORD,IDATA
      CHARACTER*1 CDATA(2)
      EQUIVALENCE(CDATA,IHWORD)
      NBYTE = 2
      
      CALL READCH(ILUN,CDATA,NBYTE,IOS)
      IDATA = IHWORD

      END
****************************************************************
      SUBROUTINE READBYTE(ILUN,IDATA,IOS)      
      INTEGER*1 IBYTE,IDATA
      CHARACTER*1 CDATA
      EQUIVALENCE(CDATA,IBYTE)
      NBYTE = 1
      
      CALL READCH(ILUN,CDATA,NBYTE,IOS)
      IDATA = IBYTE
      
      END
****************************************************************
* the F compiler doesn't know FGETC, but g77 does
      SUBROUTINE READCH(ILUN,CDATA,NBYTE,IOS)      
      CHARACTER*1 CDATA(NBYTE)

      DO I=1,NBYTE
         IOS = FGETC(ILUN,CDATA(I))
         IF( IOS.NE.0 ) RETURN
      ENDDO
      END
      SUBROUTINE READINT(ILUN,IVAL,NBYTE,IOS)      
      CHARACTER*1 CDATA(4)
      INTEGER IVAL,IWORD
      EQUIVALENCE(CDATA,IWORD)
      
      DO I=NBYTE,1,-1
         IOS = FGETC(ILUN,CDATA(I))
         IF( IOS.NE.0 ) RETURN
      ENDDO
      IVAL = IWORD
      END