1. 1 Computer System The Components of a computer system are: Hardware Software Users

2. 2 System Unit: CPU, main memory drives, and the power supply. Input Devices: Keyboard & mouse Output Devices: monitor Peripherals: any piece of hardware that is connected to a computer. Used to perform special input and output tasks. Printer, scanner & modem The Major components of a PC are:

3. 3 ALUCU Memory Central Processing Unit Secondary Storage OutputDevices Input Devices Chapter 2: Hardware

4. 4 Hardware 1) Central Processing Unit (CPU): Chip called Microprocessor. Follows the instructions of the software to process data producing information. Parts of a CPU:  ALU( Arithmetic & logic unit): The ALU consists of electronic circuitry to perform arithmetic operations (addition, subtraction, multiplication and division), logical operations (and, or, not, …) and to make some comparisons (less-than, equal, … etc.)  Registers or Immediate Access Memory  Control Unit

5. 5 2.Input Devices Translate data from form that humans understand to one that the computer can work with. Most common are keyboard and mouse

6. 6 Input Devices Keyboard Mouse Trackball Touch Pad Touch Screen Light pen Scanners: FlatBed, SheetBed & HandHeld Stationary Scanners & Drum Scanners Joystick Microphone Disk Drives Digital Camera Video Camera

7. 7 Pieces of equipment that translate the processed information from the CPU into a form that humans Can understand. 3.Output Devices

8. 8 Output Devices uMonitors: Video Display Units (VDU) Types of monitors: Cathode Ray Tube (CRT) A Flat-Panel Display (Liquid Crystal Display LCD) Characteristics of monitors: Colors, Size, Resolution: Pixels, Multiscan :screen can display different Resolution uLED Displays: Light Emitting Diodes

9. 9 uPrinters FDaisy Wheel: Slow & noisy, produces carbon copies FDot matrix printers Reasonably quick and very cheap to run. Colour is limited and requires a change of cartridge. Very Noisy. FInkjet printers Better results that a dot matrix Can be purchased fairly cheaply, even the colour models Quieter than a dot matrix. Slower than a Laser Printer Replacement ink cartridges are quite expensive making running costs high Lower quality than a Laser Printer FLaser printers High quality printouts Very quick and cheap to run Expensive to buy especially colour uPlotters uSpeakers uSpeech Synthesizers uRemovable Media uProjectors

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