TOPS-10/TOPS-20 FORTRAN Language Manual

This reference manual provides a comprehensive description of the FORTRAN language as implemented for the TOPS-10 (FORTRAN-10) and TOPS-20 (FORTRAN-20) operating systems. The document is organized into three main parts:

• Part I (Language Elements): Covers the fundamental components of FORTRAN, including character sets, constants, symbolic names, variables, arrays, and expressions.
• Part II (Statements): Details all FORTRAN statements, covering specification and data, assignment, control, and data transfer operations.
• Part III (Language Usage): Explains how to use the FORTRAN compiler, the interactive debugger (FORDDT), the Object Time System (FOROTS), and real-time software on TOPS-10, along with general programming considerations and optimization techniques.

The manual is designed for users familiar with FORTRAN and includes detailed information on language syntax, compiler switches, and error reporting, as well as several appendices providing summaries, character code sets, and plotter subroutine references.