现代半导体技术把数字系统中许多常用的功能部件,如译码器、数码选择器、编码器、加法器、数字比较器、奇偶校验器、计数器、移位寄存器等等,做成中规模集成电路,简称MS1电路。由于用MS1电路组装的系统具有结构简单,系统功耗低,可靠性高,设计系统容易、生产、调试、维修方便等优点,因此,MS1电路目前已被广泛应用于各种电子设备中,只是在标准中、大规模集成电路难于实现的逻辑功能,或经济上不合算时,才采用小规模集成电路。在1986年5月厦门会议上通过的电子技术基础教学基本要求中,也强调了中规 Modern semiconductor technologies make many of the common features in digital systems such as decoders, digital selectors, encoders, adders, digital comparators, parity-checkers, counters, shift registers, etc. into medium-scale integration Circuit, referred to as MS1 circuit. Because the system assembled with MS1 circuit has the advantages of simple structure, low power consumption, high reliability, easy system design, production, commissioning and maintenance convenience, the MS1 circuit has been widely used in various electronic devices at present. In the standard, large-scale integrated circuits are difficult to achieve logical function, or economically uneconomical, only use small-scale integrated circuits. In the May 1986 Xiamen meeting adopted by the basic requirements of electronic technology teaching, but also stressed the rules