SSD2上课pptUnit 1.ppt

Unit 1. Computer Systems Unit 1 : Computer Systems 1.1 Overview of Computer Systems 1.2 Evolution of Computer Systems 1.3 Data Representation in a Computer System 1.1 Overview of Computer Systems 1.1.1 Components of a Computer System Gain a general overview of computer system components, the hardware system, the software system, and the network system. 1.1.1 Components of a Computer System (1)Hardware System (2)Software System — Operating System Software and Application Software (3)Network System (1) Hardware System The hardware system consists of external and internal physical components that enable a computer to accept input, process the input, store data, and produce outputs. (2) Software System The two different types of software programs are Operating System Software Windows, Mac OS , Linux, UNIX,… Application Software. Word processing software, Graphics software, Music software, Entertainment software,… Operating system software Operating system (OS) provides instructions to manage a computer’s resources. Operating system tasks: Manage processor Manage memory Manage input/output devices Manage file system Establish basic elements of user interface Application software Application software provides instructions that enable the user to perform specific tasks such as creating presentations, composing written documents, and editing images. You can view the application software on your computer by clicking on the Start button and select Programs. (3) Network System The network system manages how data is transferred from one computer to another and how different components of a network system work together. Network System A network interface card (NIC) sends data from a computer over a network, and collects incoming data sent by other computers. A modem is a device that enables data from a computer to be transmitted via phone lines or television cable lines to reach other computers on the Internet. In addition to these hardware network compon