一、前言在1971年微处理机Intel 4004出现后的头几年,人们并没有充分理解到微处理机在交换系统中的应用,而交换系统中的设计者们,对微处理机的程序编制技术及接口规格也不熟悉,对于微处理机的处理能力与应用上的灵活性、可靠性也不充分了解。后来由于处理能力更强的微处理机如InteL8085等以及其它类型的产品如M6800等陆续出现,才引起通 I. INTRODUCTION In the first few years after the microprocessor Intel 4004 appeared in 1971, people did not fully understand the application of microprocessors in the exchange system. The designers in the exchange system did not have the right to program the microprocessors Technology and interface specifications are not familiar with, for the microprocessor processing power and application flexibility, reliability is not fully understood. Later, due to more capable microprocessors such as InteL8085 and other types of products such as M6800 appear one after another, it caused