OS/78 BASIC

This document provides a comprehensive guide to OS/78 BASIC, an interactive programming language designed for scientific and business environments. It details the four major components of the BASIC subsystem (Editor, Compiler, Loader, and Run Time System), explains the basic instruction repertoire, and outlines how to call and interact with the BASIC editor. The manual also covers data formats, including numeric information and string handling, and provides detailed descriptions of various BASIC statements, such as loops (FOR/NEXT), conditional and unconditional branching (GOTO, IF-THEN, GOSUB, RETURN), and file handling operations (FILE#, PRINT#, INPUT#). Finally, the guide lists built-in functions, including arithmetic, trigonometric, and string-handling functions, and provides a reference for compiler and run-time error messages.