FORTRAN Reference Manual

This manual provides comprehensive documentation on the FORTRAN-20 language, as implemented for the DECsystem-20. It covers fundamental language elements like character sets, data types, constants, variables, and arrays. It also details control statements, I/O operations (including sequential and random access), compilation control, specification statements, and subprogram structures. Additionally, it serves as a guide for using the FORTRAN-20 compiler, integrating it with non-FORTRAN programs, and utilizing optimization techniques.