A Model for the Prediction of Assembly, Rework, and Test Yields

The increase in density and complexity of computer components used as field-replaceable units of the IBM 3081 processors has required more sophisticated and capital-intense manufacturing and test lines than heretofore seen. To help in the manufacturing planning effort, a simulation model based on the concepts described in this paper was implemented as a means for studying the behavior of different assembly/test methodologies and to predict the throughput capabilities of various manufacturing configurations. By adopting a different simulation philosophy, the model was greatly simplified, and by taking advantage of the matrix processing features of APL, modeling changes required due to procedure or test-equipment changes could easily be implemented. This paper reviews the philosophy of the simulation of computer part assembly, takes a new look at modeling, and describes the architectural concepts embodied in the implementing program. It also details some of the more important concepts needed to complete the simulator.