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  • 1. CH#1 1
  • 2. CH#1 1
  • 3. CH#1 computer systemComputer SystemDefinition:A system of interconnected computers that share a central storage systemand various peripheral devices such as a printers, scanners, or routers. Eachcomputer connected to the system can operate independently, but hasthe ability to communicate with other external devices and computers.Components of a Computer SystemCan you identify the:Computer Case 1. Monitor 2. Speakers 3. Keyboard 4. Mouse 1
  • 4. CH#1 computer system 5. Printer 6. Scanner 7. Web camera 8. Floppy drive 9. CD or DVD drive Parts Of Computer System 1
  • 5. CH#1 computer systemThe two basic parts of a computer system: 1. Hardware: The hardware is the part of the computer you can touch and see.(ex. Keyboard, mouse, monitor) 2. Software: The software is a part of the computer you cannot touch but is very important. The software is all the programming that makes the computerrun.Common computer hardware:The following is a list of the most common hardwarefound on office and home computers. The monitor is the display screen, similar to a televisionscreen. The keyboard is what you type on, similar to a typewriter. The mouse is small hand held device that attaches to thecomputer. It may have two or three buttons. 1
  • 6. CH#1 computer system The computer tower or case is the heart of the system. This is abox that contain all the parts that make the computer work. The printer is a device that puts what you have to created onthe paper The scanner is a device that capture picture so that theycan b seen and used. Computer SoftwareSoftware also called a program, consist of a series of instructions that tells thecomputer what to do and how to do.Types of computer software : System software Operating software Utility program Application software 1
  • 7. CH#1 computer systemSystem software:System software consists of the programs that control or maintain the operations ofthe computer and its devices. Operating software: An operating system is a set of programs that coordinates all the activities among computer hardware. Utility program: A utility program allows a user to perform maintenance-type tasks usuallyApplication software: Application software consists of programs designed to make users more productive and assist them with personal tasks .Information systemAn information system(IS) is typically considered to be a set of interrelated elements orcomponents that collect(input), manipulate(processes), and disseminate (output) data andinformation and provide a feedback mechanism to meet an objective. 1
  • 8. CH#1 computer system 1
  • 9. Ch#2 computer categoriesComputer categoriesComputer systems can be categorized according to their processing speedand power into: A microcomputer is a computer that can perform all of its input, process, output, and storage activities by itself. A minicomputer is often used in situations where a microcomputer is not powerful enough but a mainframe is too expensive. A mainframe is a large, expensive, but powerful computer that can handle hundreds or thousands of connected users at the same time. A supercomputer is the fastest, most powerful, and most expensive computer used for applications that require complex and sophisticated mathematical calculations.Other terms related to the classification of computer systems include: Personal computer Stand-alone computer Server Client computer Network computer Workstation Terminal Embedded System The five categories of computer are: Super Computers Mainframe Computers Workstation computer Micro Computer Minicomputer 1
  • 10. Ch#2 computer categoriesSupercomputer: A computer which, among existing general-purpose computers at any given time,is http://www.answers.com/topic/superlative, often in several senses: highest computation rate, largest memory, or highest cost.Mainframe Computers:a large digital computer serving 100-400 users and occupying a special air-conditioned room. 1
  • 11. Ch#2 computer categories Workstation computers:This computer has more computing capacity in its CPU than a typicalpersonal computer. Scientists and engineers are the main users ofworkstations, although people who process graphics find a workstationnecessary, since the processors can handle the huge amounts of dataassociated with Graphic files.Minicomputer:Minicomputer: A mid-sized computer, usually fitting within a single cabinet about thesize of a refrigerator that has less memory than a mainframe. 1
  • 12. Ch#2 computer categoriesMicro computer:Computing device made up of one or more microprocessors,stored program memory (called read only memory or ROM), random accessmemory (RAM), input/output logic, and usually one ormore data input (keyboard/mice/stylus) anddata output (screen/printer) devices. Desktop computers (personalcomputers) are all also called microcomputers. 1
  • 13. Ch#3 system unitSystem Unit: The system unit refers to the computer itself but does not include the monitor, the keyboard,the mouse, or any other peripherals. I suppose most people will probably know what you meanwhen you refer to "the box," but saying "system unit" will definitely make you sound moresophisticated: Parts of system unitMouse:A device that controls the movement of the cursor or pointer on a display screen. A mouse is asmall object you can roll along a hard, flat surface. Its name is derived from its shape, whichlooks a bit like a mouse, its connecting wire that one can imagine to be the mouses tail, 1
  • 14. Ch#3 system unitMonitor:A monitor or display (also called screen or visual display unit) is an electronic visual display fora computer.Motherboard:The motherboard is the main circuit board in a computer. A motherboard provides a way forhardware in a computer to communicate with each other. 1
  • 15. Ch#3 system unitKeyboard:In computing, a keyboard is a typewriter-style keyboard, which uses an arrangement of buttonsor keys, to act as mechanical levers or electronic switches.Central Processing Unit (CPU):The CPU (central processing unit) is the part of a computer controls the interpretation andexecution of instructions. Generally, the CPU is a single microchip, but that doesnt necessarilyhave to be the case. The Central Processing Unit (CPU) is the "brain" of the computer--it is thecompute in computer. Without the CPU, you have no computer. AMD, IBM, 1