DECSYSTEM-20 Monitor Internals

This document provides a comprehensive technical overview of the DECSYSTEM-20 monitor internals. It contains detailed monitor flowcharts covering topics such as the scheduler, page fault handling, JSYS calls (device-independent and dependent levels), and interrupt handling. Additionally, it provides extensive descriptions and formatting information for numerous monitor tables, including memory management, file system structures, device management, and terminal control blocks. It is intended for system programmers.