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Porting Fortran

This section talks about porting existing Fortran code for VICAR applications. It does not go into all the rules for writing portable Fortran; see a reference book on Fortran for that (there are a few allowed VMS extensions to Fortran, which are described below). Rather, it talks about portability in the VICAR context. It also describes how to deal with machine dependencies in VICAR code, which is useful when writing new code as well as when porting old code.