Fundamentals of Time Sharing

This document is the second and concluding section of an article by C. Gordon Bell regarding the fundamentals of time-sharing computer systems. It details the essential software components required for a time-sharing operating system, including the data base, scheduling, memory allocation, and file management. Additionally, it explores user components, specifically focusing on terminal types and their characteristics, communication dialogue between users and the operating system, and the hierarchy of processes. The document also presents an example of a time-sharing system on the DEC PDP-6, providing insights into its memory organization, system functions, and job management. It concludes with an analysis of present challenges in time-sharing system design and considerations for future systems.