一、前言当前由多微处理机组成的多机系统,正受到国内、外普遍的重视,它已成为计算机、自动控制技术应用的重要发展方向。由它组成的多机系统一方面正在与大型、甚至巨型计算机系统相抗争,另方面又正在取代计算机集中控制系统。在这样系统中由微处理机组成的子系统,由于其本身都具有信息处理功能;因此,它既可 I. INTRODUCTION Currently, the multi-machine system composed of multi-microprocessors is receiving widespread attention both at home and abroad. It has become an important development direction for the application of computer and automatic control technology. The multi-machine system composed of it is on the one hand to contend with the large-scale and even the giant computer system and on the other hand it is replacing the centralized computer control system. Subsystems made up of microprocessors in such a system, because of their own information processing capabilities, can either