引言所有计算机用户和厂家充分认识到:从一台计算机系统转换到另一台具有不同机器语言的计算机系统,存在着许多障碍和极大困难。在从第二代系统发展到第三代的过渡时期,上述这种转换困难是最费劲而且也是最费钱的。尤其是IBM 公司从第二代五种不同型号的机器过渡到IBM 360更是如此。IBM 360已问世七年,但用户程序仍有一定的百分比没有完全转换过去,其中某些程序完全没有转换。由于上 Introduction All computer users and manufacturers are fully aware that there are many obstacles and great difficulties in switching from one computer system to another with different machine languages. In the transition from the second generation system to the third generation, the above transition difficulties are the most expensive and the most expensive. In particular, IBM is moving from the second generation of five different models of machines to IBM 360. IBM 360 has been around for seven years, but a certain percentage of user programs still do not completely convert, some of which have not been converted at all. Because of it