File:Compatible time-sharing system A programmer's guide - Figure 1.1.png - Wikimedia Commons
CTSS - Compatible Time Sharing System
Time-sharing - Wikipedia
Compatible Time-Sharing System (1961-1973) Fiftieth Anniversary Commemorative Overview
Operating System Overview Chapter 2 1 Operating System
The Guy Who Invented the Password Did It Out of Need, Not Security
Fernando Corbató, whose work on Compatible Time-Sharing System (CTSS) in the 1960s helped pave the way for the personal computer, as well as the computer password, died at the age of 93.