An overview is provided of the Experimental Time-Sharing System (ETSS). Few manufacturers of small-scale and medium-scale computers offer operating systems capable of supporting both terminal-oriented time-sharing and multiprogramed batch processing. ETSS was developed to demonstrate that a powerful, general purpose operating system of this type…

The paper descibes a compact and highly efficient disk file management system responsible for the management and allocation of space on moving head disk drives in a medium-scale time-sharing system. The disk file management system is a major component of the Experimental Time-Sharing System (ETSS) developed at the Learning Research and Development…

The evolution of a medium scale, general purpose, multi-language, time sharing computer system at the Learning Research and Development Center (LRDC) at the University of Pittsburgh is detailed. A strategy for the interfacing and control of laboratory devices is described with respect to several application environments; experimentation in the…

A description is provided of the Experimental Time-Sharing System (ETSS), a multi-language, general-purpose time-sharing system designed to support a wide range of computing applications. Included among these are the control of an on-line behavioral research laboratory. Major topics discussed in the report are: 1) the system's hardward…