TOPS-10/TOPS-20 FORTRAN Reference Card

This document is a "TOPS-10/TOPS-20 FORTRAN Reference Card," a pocket-sized booklet published by Digital Equipment Corporation in March 1983. It serves as a concise summary of the major elements of the FORTRAN language, specifically for FORTRAN-10 V7 and FORTRAN-20 V7 compilers, as well as the related Object Time System (FOROTS) and debugging program (FORDDT), all at Version 7. It notes its contents are a subset of the full FORTRAN Language Manual.

The reference card aligns with the ANSI FORTRAN x3.9-1978 (FORTRAN-77) standard, highlighting Digital's extensions. Its content is organized into several key areas:

• FORTRAN Usage: Instructions for compiling, executing, and debugging programs, including detailed compiler switches and arguments for both TOPS-10 and TOPS-20 environments.
• FORTRAN Elements: Fundamental language components such as the hierarchy of FORTRAN operators, the character set, and the structure of fields within a FORTRAN line.
• FORTRAN Statements: A comprehensive summary of all FORTRAN statements, their ordering, and specific specifiers for OPEN and CLOSE commands.
• Formatting: Details on repeatable and nonrepeatable edit descriptors, carriage-control specifiers, and the effect of data magnitude on G-Format output conversions.
• Functions and Subroutines: Lists of FORTRAN intrinsic functions, as well as Digital-supplied external functions and subroutines.
• FORDDT Usage: Guidance on loading, starting, and using commands for the FORTRAN debugging program.
• General Information: Miscellaneous technical data, including logical device assignments, device and mode cross-tables, argument types and codes, FOROTS error codes and values, comparison of real, D-floating, and G-floating numbers, legal dummy and actual argument associations, and ASCII/graphic character codes with detailed remarks.