Chapter 1.1.2


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Chapter 1.1.2

  1. 1. THE COMPUTER SYSTEM CHAPTER 1.1.2 By Keshuv Hookoom
  2. 2. The Computer System <ul><li>A system is a group of components designed for a particular job. </li></ul><ul><li>Example compact disc (CD) player is a system. </li></ul><ul><li>The CD system consists of a disc player, compact disc and speakers. </li></ul><ul><li>A computer is consisted of a number of electronic components. </li></ul><ul><li>The electronic component is known as an electronic system or simply a computer system. </li></ul>
  3. 3. The computer Systems <ul><li>A computer system normally consists of a System unit, Keyboard, Monitor, mouse and Printer. </li></ul>Keyboard Monitor Mouse Printer Cpu
  4. 4. <ul><li>The brain of a computer is the processor. </li></ul><ul><li>The entire processor is built on a piece of silicon – known as microchip or chip. </li></ul><ul><li>Forms of computer storage : </li></ul><ul><ul><li>Main memory </li></ul></ul><ul><ul><li>Permanent storage </li></ul></ul><ul><li>Main memory : refers computer working space; it is available in form of chips. </li></ul><ul><li>Permanent storage : when you turn off the computer the information in the main memory will be lost; to prevent this every computer needs to have a permanent storage. </li></ul>
  5. 5. <ul><li>Permanent storage devices allow data or programs to be stored. </li></ul><ul><li>The common forms of permanent devices are: </li></ul><ul><ul><li>Floppy disks </li></ul></ul><ul><ul><li>Hard disks </li></ul></ul><ul><ul><li>CD-ROMs </li></ul></ul><ul><li>A floppy disk stores small amounts of data. </li></ul><ul><li>Floppy disks comes in 2 sizes: </li></ul><ul><ul><li>5.25” </li></ul></ul><ul><ul><li>3.5” </li></ul></ul><ul><li>A floppy disk can store larger quantities of data and programs. </li></ul><ul><li>CD-ROM’ stands for Compact Disc Read-only Memory. </li></ul>
  6. 6. <ul><li>Being a read-only device, information stored on a CD-ROM cannot be changed. </li></ul><ul><li>Do you know that a single CD-ROM can store as much information as 500 floppy disks? </li></ul><ul><li>The large storage capacity of a CD-ROM makes it a suitable device for sorting text as well as studio and video information. </li></ul><ul><li>CD-ROMs make use of laser or light technology in storing and reading information. </li></ul><ul><li>Like cassettes, floppy disks, hard disk and CD-ROMs need players for recording and for playing back. </li></ul>
  7. 7. <ul><li>Processed data can be viewed on a monitor. </li></ul><ul><li>The surface of the monitor on which information is displayed is called screen . </li></ul><ul><li>The monitor is an output device. </li></ul><ul><li>The processed data (the output) displayed on the monitor screen is called the soft copy . </li></ul><ul><li>The printer gives a printed output on paper is called a hard copy . </li></ul><ul><li>Input units and output units are collectively called input/output units(l/0 units) or peripherals. </li></ul>
  8. 8. Hardware and Software <ul><li>The different components such as processors, peripherals, memory chips, storage devices, etc. That makes up a functioning computer are called hardware . </li></ul><ul><li>Computer hardware alone cannot do any processing job. A program is needed to tell the computer what to do. Programs are also known as software . </li></ul>
  9. 9. <ul><li>Hardware is like an audio cassette player. </li></ul><ul><li>Software is like the music recorded in the cassette. </li></ul><ul><li>Hardware can be seen but Software can’t be seen until printed on paper. </li></ul><ul><li>English, Arabic, Chinese and Afrikaans are examples of human languages that computers cannot understand. </li></ul><ul><li>Computers can only understand special programming languages such as BASIC, LOGO, Pascal, Java, etc. </li></ul><ul><li>Computer software can be written using any of these programming languages. </li></ul>