在外行人看来,计算机好象很聪明,其实,它那“聪明”,归根到底,是人(特别是内行的计算机专家)赋予它的.它每做一件事,哪怕很简单的微小动作,都有赖于人的指示.人所用以指示计算机做各种各样事的指令,集合起来,就是该台计算机的指令集.计算机只认这些指令.为解决某一特定问题所要用到的所有指令一条一条地按顺序排列起来,便是所谓“程序”(或“软件”).不同的计算机有不同的指令集,不同的计算机,指令条数多少不一.在计算机研制的早期,人们以为,计算机所能辨识和执行的指令越多,功能便越强,编制程序便越方便,编出的程序功能便越强.因此,计算机的指令集越来越大,条数越来越多,从最初的二、三十条到几百上千条.而 To the layman, the computer seems to be very clever, in fact, it is “smart”, in the final analysis, is given by the people (especially the computer experts), it does one thing, even a very simple little action, All rely on the instructions of the people. The instructions that a man uses to instruct a computer to do all sorts of things, together, are the instruction sets of that computer. The computer recognizes only those instructions. All instructions to solve a particular problem Orderly arranged one by one, is the so-called “program” (or “software.”) Different computers have different instruction sets, different computers, the number of instructions vary in the early days of computer development, people think, The more instructions a computer can recognize and execute, the more powerful it is, the easier it is to program, and the more powerful the program is. Therefore, the instruction set of computers is larger and larger, The first two or thirty to hundreds of thousands