This chapter discusses Compaq Fortran standards conformance and language compatibility, and provides an overview of Fortran 95, Fortran 90, and High Performance Fortran features.

**Figure 1-1 Graphic Representation of Compaq Fortran**

Fortran 95 includes Fortran 90 and most features of FORTRAN 77. Fortran 90 is a superset that includes FORTRAN 77. Compaq Fortran fully supports the Fortran 95, Fortran 90, and FORTRAN 77 Standards.

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