Disk Operating System Monitor

This document provides a detailed guide for the PDP-11 Disk Operating System (DOS) Monitor. It is structured into three main chapters: an introduction to the Monitor's core organization and hardware requirements, a comprehensive definition of programmed requests (macro calls) for I/O and directory management, and a guide to operator keyboard commands. The manual includes detailed technical information on device drivers, programmed requests, system error messages, and memory mapping. The document is designed for the PDP-11 programmer and assumes familiarity with the PDP-11 Handbook and PAL-11R Assembler.