The 0825 Automatic Operating and Scheduling Program

This paper concerns a general executive program for the Burroughs D825 Modular Data Processing System. The D825 is a large-scale, multicomputer, expansible, general-purpose, digital system employing automatic parallel processing and an extensive system of interrupts, and is especially suited to military command and control applications. Military designation is AN/GYK-3 (V). The implementation of the executive program, called the Automatic Operating and Scheduling Program (AOSP), was completed in the fall of 1962 and demonstrated at the 1962 Fall Joint Computer Conference (AFIPS). Since then, the AOSP has undergone testing with a variety of program mixes. While the bulk of the AOSP concerns retrieval of named objects from files, run-time allocation of memory, and input/output (I/O) control, the primary AOSP function is to provide facilities for multicomputer multiprocessing-that is; the use of one, hvo, or more processors (computer modules) by time-sharing their arithmetic/control functions between one or more object programs under control of an executive system. In this way, not only maya program time-share a processor with other programs, but a processor may time-share the execution of a program with other processors. The programmer need not indicate that his program may be processed in parallel with other programs; the AOSP effects parallel proc-