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Design of A User Microprogrammable Computer

It has been expected that the 4th generation computers will be characterized for their problem adaptability. There are few techniques of implementing such a characteristic. One of the techniques that one have considered in this paper the user microprogrammable computer architecture. There are two different computer architectures that support user microprogramming. One uses the writeable control storage and another uses the main memory. The concept of utilizing writeable control storage for microprogramming was developed in 1950's and since then the most of the user microprogrammable computers produced belong to such category. The concept of utilizing the main memory for user microprogramming was first introduced by Thomas in 1973. This architecture has a strong advantage in the aspect of the system cost. In this paper, we have developed a user microprogrammable computer. The computer utilizes the main memory for user microprograms. It employs a 32 bit micro-instruction word in the form of the little encoded. The performance of the developed machine will be evaluated in the hard ware cost, programming easiness and the running time.