引言目前衡量电子计算机技术水平的先进性时,常常是根据它所用半导体逻辑电路的集成度.而衡量其性能时,又是以它的速度和存储器容量为主.但是对于编制计算机软件的程序人员来说,除了存储容量外,还更关心计算机的体系特性.它包括数据和指令格式、字符编码表、指令表、寻址范围和编址方式、输出入通 Introduction The current measure of the advanced level of computer technology, often based on the logic used in the semiconductor integrated circuit, while its performance is measured by its speed and memory capacity.But for the preparation of computer software programmers In addition to storage capacity, but also more concerned about the characteristics of the computer system.It includes data and instruction format, character encoding table, instruction list, addressing range and addressing mode, the output of the pass