ANSI-77 FORTRAN Information Document

This "ANSI-77 FORTRAN Information Document" (EY-1233E-ID-0001), published in April 1983 by Digital Equipment Corporation's Educational Services, provides a summary of the ANSI X3.9-1978 FORTRAN-77 full language standard.

The document serves as a reference for software specialists, detailing Digital's specific implementations of FORTRAN-77 on their TOPS-10/20, VAX-11, and PDP-11 operating systems.

Key areas covered include:

• General ANSI-77 FORTRAN features: Character conventions, control statements (e.g., BLOCK IF, DO loops), and input/output procedures.
• Platform-specific features: Detailed discussions of new features, extensions, compiler optimizations, and compatibility considerations (including differences from FORTRAN-66) for TOPS-10/20 FORTRAN (Version 7), VAX-11 FORTRAN (Version 3), and PDP-11 FORTRAN (Version 4).
• Unsupported features: Lists FORTRAN-77 features that are not supported on specific DEC platforms.
• Comparative tables: A dedicated section provides comprehensive tables comparing various FORTRAN language features across different American National Standards and Digital's FORTRAN implementations on PDP-8, PDP-11, VAX, and TOPS-10/20 systems.

The document is designed to provide a quick review of changes and new functionalities for users familiar with FORTRAN programming and the respective operating systems.