In this two-part series of articles the basic principles of designing a 16-bit computer made upof 4-bit bit-slice devices are discussed. The first part considers the data processing "and control sections of such a system. Fixed instruction set microprocessors have been very popular for the last five years and have been increasingly used in new applications. These microprocessors are manu- factured using MOS technology and all data processing and control logic are implemented on a single chip. In some cases, the program memory, data memory and input/ output ...