计算机英语(第四版)PPT.2.1-作者：刘兆毓、郑家农(普通高等教育“十一五”国家级规划教材 ).pptVIP

计算机文化基础 * PART 1 COMPUTER HARDWARE CHAPTER 2 COMPUTER OPERATING SYSTEM chapter 5-5.1 2.1 SUMMARY OF OPERATING SYSTEM 2.1 SUMMARY OF OPERATING SYSTEM *Main point Main point: ● Functions of operating system ● Job management ● Resource management ● Control of I/O operations KEYWORDS job management 作业管理 resource management 资源管理 job queue 作业队列 input/output control system(IOCS) 输入输出控制系统 batch system 批处理系统 time-shared operating system 分时操作系统 offline operation 脱机操作 real-time system 实时系统 KEYWORDS buffering 缓冲技术 spooling system 假脱机系统 multiprogramming 多道程序设计 *?1 ?1 What are two main purposes of developing operating system ? Operating systems have developed over the past thirty years for two main purposes. First, they provide a convenient environment for the development and execution of programs. Second, operating systems attempt to schedule computational activities to ensure good performance of the computing system. 目的状语 *?2 定语从句 时间状语从句 As we have stated, operating systems are normally unique to their manufacturers and the hardware in which they are run. Generally, when a new computer system is installed, operational software suitable to that hardware is purchased. Users want reliable operational software that can effectively support their processing activities. ?2 Are operating systems normally related to their manufacturers and hardware? 定语从句 Though operational software varies with manufacturers［1］,it has similar characteristics.[1] Modern hardware, because of its sophistication, requires that operating systems meet certain specific standards. For example, considering the present state of the