PDP-11 COBOL

This document is a reference guide for the PDP-11 COBOL compiler (Version 3), intended for experienced programmers. It covers file structures, data formats, compiler features, error messages, available I/O devices, good programming practices, and debugging techniques. It also describes two utility programs: COBRG (for report generation) and REFORMAT (for converting between conventional and terminal formats). The guide is a companion to the PDP-11 COBOL Language Reference Manual.