Methods for opening files, making system calls and storing unformatted data are not the same in all versions of Fortran. The codes in this section attempt to give these a common set of calls so that all changes needed to switch compilers can be made by simply including a different system file in the set of files for compilation.
1. WSYSTEM.FOR – system files for Watfor
2. openwsys.for – system files for open watcom.
3. intelsys.for – system files for intel-10
4. unixsys.for – f77 files