1.引言微处理机问世以来仅有几年的时间,但却有了几代的变化。一般认为4004,8008为第一代,8080,6800为第二代,而Z-80则是在8080基础上向前跨了一大步的新的一代微处理机。有人认为Z-80为第三代的微处理机,而有的人则认为Z-80为二代半的 1. Introduction Microprocessors have been available for only a few years, but have had several generations of changes. Generally considered 4004,8008 for the first generation, 8080,6800 for the second generation, and the Z-80 is based on the 8080 step forward a big step forward a new generation of microprocessors. Some people think that Z-80 is the third-generation microprocessor, while others think Z-80 is two and a half