Abstract
This report presents the design and application of a digital expansion system for the Arizona Statistical Repetitive Analog Computer (ASTRAC I). The system is composed of two modules which are made up of three operational amplifiers, two bistable multivibrators, two Schmitt triggers, two inverting/differentiating amplifiers, and a number of plug-in electronic switches and diodes for assembling digital gate circuits. The digital-expansion modules give ASTRAC I additional decision-making capacity and aid in the study of optimal-system design, sampled-data systems, correlation-function estimation, and non-linear system simulation, to name only a few applications. Optimization-type solution of a boundary value problem, simulation of a point mass striking a reflecting frictionless surface, and estimation of correlation functions are presented as examples of applications for the digital system.
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