Developing a midrange computer system in a country like Korea is a difficult task. It is because of the lack of computer related technologies, appropriate manpower and the sufficient domestic market. Thus, only a few country except the United States has succeeded in developing her own model of computer systems. Fortunately, Korea became one of them. In this paper, we will present some special features of TICOM and how we successfully developed our own model of a midrange computer system with respect to system engineering point of view. The Difficulties and suggestions from the experience of the development of TICOM will also be described.