Safeguard Data-Processing System: Central Logic and Control Operating System

Abstract

The Central Logic and Control (CLC) is the digital computer that controls Safeguard. This paper describes the novel features of the CLC operating system, presents its design rationale, and points out its limitations. Emphasis is on the characteristics that make the operating system suitable for applications other than Safeguard. These include its ability to control as many as ten processors, its ability to initiate the execution of a program within milliseconds of an event, and its ability to detect and isolate faulty hardware racks without manual intervention.

Safeguard Data-Processing System: Structured Programming and Program Production Librarians

“…The project comprised the development of independent functional tests for the CLC operating system. 2 The complete set of tests was developed incrementally over several years, and the end product was a set of test specifications and the programs implementing them. Data for this study were gathered from the development of the test monitor facility and the first 11 test sets.…”