The Boeing integrated hybrid operating system

A Hybrid Computing Complex must serve both experi enced and inexperienced users. It must handle both small and large engineering problems efficiently. It must be economical to use in all cases. The Operating System employed largely determines how well the Complex func tions. The Hybrid Operating System described here (de signed and implemented, under the supervision of the author, at The Boeing Company, Aerospace Group, Seattle, Washington) meets these requirements. It provides a hy brid form of compile-set-up-and-go operation. However, the quality of the man/machine "dialog" possible with analog computation is preserved. It includes all the system software; i.e., processors, monitors, executive systems, libraries and hybrid utilities. The system design minimizes resident memory size for any one mode of operation. Its modular control structure permits growth in several system dimensions. The system was designed for an SDS 9300 (with 24K core, four tapes and DES-1) coupled through an SDS interface (with extensive sense, control and interrupt structure) to a modified EASE 2100. The appendix provided discusses experience with the system to date, and some of its limitations.