The real-time command and control environments characteristic of tactical military systems and industrial process control systems place unique and conflicting design requirements on a support computer system. These requirements include fast context switching, selective protection of programs and their files, controlled sharing of program and files, high processing speed, flexible, yet fast priority structure for interrupts and program execution, flexible high-speed I/O and flexible intercommunication and control for interacting programs. This paper describes a new computer system now being prototyped to satisfy these requirements. The system design includes a number of unique features relating to the efficient implementation of a flexible virtual memory addressing system for the stringent real-time environment.

This paper discusses the design of a real-time computer. The computer's design requirements, design decisions, and architecture are summarized. The paper discusses how the design requirements influenced the computer architecture. The system's three upward compatible addressing options (real, base, virtual) are also discussed.

Abstract The problem of selecting a general‐purpose timesharing system satisfying performance criteria for user‐oriented tasks is examined and a new approach is developed. This approach characterizes the user workload by a set of terminal user level functions and results in a representative script. A response time definition is developed and employed to measure the Xerox Sigma 7/UTS timesharing system and user community at McDonnell Douglas Automation Company.

Abstract The use of a software monitor in validating a cyclic server multiprogramming model of OS/360 is presented. Following a brief development of the analytic model, a sampling software monitor designed to track CPU and channel I/O activity in OS/360 is described. A procedure for fitting the model to the system based on measurements obtained by the monitor is developed and comparative results of the adjusted model and the actual system are presented for validation of the model principles.

This paper was written in reaction to a body of literature on continious parameter tracking that has by and large ignored the use of continuous regression techniques introduced by A. I. Rubin in an earlier paper.1The case for the use of continuous regression in the parameter tracking problem is presented in a concise and professional manner. A distinction is made between t, the "real world time" employed in the formulation of the model, and in the development of the regression performance measure, and τ, the "data processing time" employed in the steepest descent circuits that are performing the minimization of the performance measure with respect to the parameters. This distinction is an important contribution, both analytically and conceptually, to the parameter identification literature; the authors' belief that other workers in the field might profit from this distinction is well founded.

This paper concerning two IBM programs was written by two IBMers for an IBM publication. This might given reason to question the objectivity of the paper and its value to the general community. In actuality, though, the two programs discussed are of sufficient general interest, if for no other reason than the popularity of the machines for which they have been implemented, and the authors have maintained sufficient perspective to warrant reading of the paper by all persons interested in continuous system stimulation