The described Simulator can be used for carrying out program tests as well as Integration tests corresponding to real conditions. The Simulation procedure delivers already significant results during the development of Computers or the design of Computer controlled systems. The collection of planning data makes it possible to obtain a survey of the Operation of the complete system at a very early stage. Finally the Simulation procedure is illustrated by an example of a Computer controlled earth Station antenna. © 1973 De Gruyter Oldenbourg. All rights reserved.