Components of Computer System:viewpoint 1 Viewpoint 1:Computer system hardware software (+data) Operating System is the first software layer on the phsical hardwares,and can be viewed as the first expansion of computer hardware system. All applications running in the OSes,more or less, directly or indirectly,call the OS functions.For example,the simplest program“hel lowor Id”. Other programs and users Operating system Hardware 4口4日，4在4生：至)QC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Components of Computer System: viewpoint 1 Viewpoint 1: Computer system = hardware + software (+data) ▶ Operating System is the first software layer on the phsical hardwares, and can be viewed as the first expansion of computer hardware system. ▶ All applications running in the OSes, more or less, directly or indirectly, call the OS functions. For example, the simplest program “helloworld”. Hardware Operating system Other programs and users