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Lesson 1 0x001 001

Lesson 1 0x001 001. Mohamed Zaki Principal Lecturer. The Computer System. Main Topics. What is a Computer? General-purpose & Dedicated Computers. Computer as a system. Computer hardware system. Peripherals Input Peripherals. Output Peripherals. Storage. Course Assessment.

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Lesson 1 0x001 001

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  1. Lesson 10x001001 Mohamed Zaki Principal Lecturer The Computer System Computer Systems / Ch. 1

  2. Main Topics • What is a Computer? • General-purpose & Dedicated Computers. • Computer as a system. • Computer hardware system. • Peripherals • Input Peripherals. • Output Peripherals. • Storage. Computer Systems / Ch. 1

  3. Course Assessment Computer Systems / Ch. 1

  4. What is a Computer? Computer: is a programmable machine that receives input, stores and manipulates data/information, and provides output in a useful format. Computer Systems / Ch. 1

  5. General Purpose and Dedicated Computers • General-Purpose computer solves many types of problems, such as (document typing, Drawing, games,..etc) • Dedicated Computers is used for only one task. (Control process in the manufacturing industry) Computer Systems / Ch. 1

  6. General Purpose and Dedicated Computers (cont.) Remark: In general a dedicated computer is the same as a general-purpose computer in its fundamental construction Computer Systems / Ch. 1

  7. System:is a set of interrelated components working together to achieve a certain goal.So, to consider a computer as a system, the computer must contain related components working together to perform the main functions. Computeras a system Computer Systems / Ch. 1

  8. Computer System Software Hardware Peripherals Central Processing Application Programs System Programs Control Unit ALU Main Memory Secondary Input Unit Output Unit Storage Computer Components As a System Computer Systems / Ch. 1

  9. 1-Computer Hardware Hardware devices can be organized accordingto the following system functions: • Input:Devices that convert data into electronic form in the computer system. • Output:The output devices are used to convert the electronic information into a human understandable form. • Processing:  The CPU is the main processing component. ALU (Arithmetic Logic Unit) will perform all the processing. • Storage: Takes place in the primary storage unit of the CPU and in secondary storage units. these devices store data and program instructions are needed for processing. • Control: control unit of the CPU is the control component of the computer system. It interprets computer program instructions and transmits directions to other components of the computer system. Computer Systems / Ch. 1

  10. Peripherals Parts of computer that transfer data in and out. • Input Peripherals. • Output Peripherals. • Secondary Storage. Computer Systems / Ch. 1

  11. Input Peripherals:Devices used for transferring data from the outside world representation into the internal character code of the computer. • Keyboard. • Barcode reader: Barcode data can be described as a sequence of vertical lines vary in thickness, light focuses on and scanned across these lines using a small laser beam, then data can be read and input to computer. Computer Systems / Ch. 1

  12. Other input peripherals: • Light pens. } • Mice } Pointing devices • Touch screens. } • Digitizers. • Scanners. • Microphones. • Cameras. Computer Systems / Ch. 1

  13. Output Peripherals • Printers 1- Impact Printer:this method of printing is based on the impact of a hard object against an ink-coated ribbon, which is then forced on the paper to make it mark the shape of the character. Computer Systems / Ch. 1

  14. Output peripherals (Impact Printers) (Cont.) • Line printers • Dot matrix printers Computer Systems / Ch. 1

  15. Output peripherals (cont.)2- Non-Impact Printers • Ink-jet printers. • Thermal printers. • Laser printers. Computer Systems / Ch. 1

  16. Comparison between printers Computer Systems / Ch. 1

  17. Output peripherals (Cont.) • Plotters. • Visual Display Unit(VDU). • Projectors (Data Show) Computer Systems / Ch. 1

  18. Secondary Storage • Optical Storage - CD (Compact Disc) - DVD (Digital Versatile Disc) • Flash Memory Computer Systems / Ch. 1

  19. Storage Units • Bit (Binary Digit): it is the smallest unit to store data,(0 or 1). • Byte (B) :it is the basic storage unit of memory. It consists basically of 8 bits. It can hold one symbol only at a time. • Kilo Byte (KB)=1024 B =210 B Computer Systems / Ch. 1

  20. Storage Units of Memory • Mega Byte (MB)=1024 KB =(1024 x 1024) B =104,8576 B = More than a Million of bytes. =210 x 210=220 B. • Giga Byte (GB)=1024 MB =(1024 x 1024) KB =(1024 x 1024 x1024) B =104,8576 KB = 1,073,741,824 B = More than a Billion of bytes. =210 x 210 x 210 = 230 B. Computer Systems / Ch. 1

  21. Storage Units % 8 1024 • 1024 • 1024 • 1024 Bit Byte KByte MByte GByte TByte * • 1024 8 • 1024 • 1024 • 1024 Bit Byte KByte MByte GByte TByte Computer Systems / Ch. 1

  22. Refreshing Questions • The ……………………. Can be described as an input device. 1.Light pen 2.HP laser jet printer 3. Plotter 4.None • A device used for transferring a paper based image into a computer image is………………. 1. Ink jet printer 2. Scanner 3. Digitizer 4. None Computer Systems / Ch. 1

  23. Refreshing Questions (cont.) • RPM stands for _________. • DVD stands for _________. • VDU stands for _________. • 10 MB =_____ KB. • Arrange the following in ascending order: 0.6GB, 840MB, 15000KB Computer Systems / Ch. 1

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