Disk Operating System Monitor

This programmer's handbook describes the PDP-11 Disk Operating System (DOS) Monitor, which manages program development and execution. The document is structured into three chapters:

• Chapter 1: An introduction to the DOS Monitor, including system organization, hardware requirements, and how to start the monitor.
• Chapter 2: Defines programmed requests for I/O services (READ/WRITE, BLOCK, and TRAN levels), directory management, and miscellaneous system functions. It also provides detailed information on data structures like Link Blocks, Filename Blocks, and Line Buffer Headers.
• Chapter 3: Explains operator keyboard commands for system control, resource allocation, and core image manipulation.

The manual also includes detailed appendices covering physical device names, EMT codes, subsidiary routine assignments, and a full summary of monitor commands and requests.