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Chapter 02 Input Output Memory Devices (3).pdf

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Chapter 02 Input Output Memory Devices (3).pdf

  1. 1. Chapter 02 Input Output Memory Devices Input Devices Keyboard:
  2. 2. Chapter 02 Input Output Memory Devices Input Devices Types of Keyboard: ➢Standard ➢Ergonomic ➢Wireless ➢Virtual ➢Compact
  3. 3. Chapter 02 Input Output Memory Devices Input Devices Mouse: (Mechanically Operated User Serial Engine) Types of Mouse: ➢Manual Mouse RJ ➢Scroll mouse ➢USB mouse ➢Wireless mouse
  4. 4. Chapter 02 Input Output Memory Devices Input Devices Joystick:
  5. 5. Chapter 02 Input Output Memory Devices Input Devices OMR, OCR AND MICR:
  6. 6. Chapter 02 Input Output Memory Devices Introduction to output devices: Monitors CRT monitor LCD monitor TFT monitor LED monitor
  7. 7. Chapter 02 Input Output Memory Devices Introduction to output devices: PRINTERS IMPACT LINE PRINTER DOT MATRIX NON-IMPACT INKJET LASER THERMAL
  8. 8. Chapter 02 Input Output Memory Devices Introduction to output devices: Characteristics of impact printers ✓There is a physical contact between paper and print assembly, hence they are useful for bulk printing. ✓Impact printers are ideal for printing multiple copies (carbon copies) because they can easily print through many layers of paper. ✓Due to its striking activity, impact printers are very noisy.
  9. 9. Chapter 02 Input Output Memory Devices Introduction to output devices: Characteristics of impact printers ✓Since they are mechanical in nature, they tend to be slow. ✓Impact do not support transparencies. ✓Measured with characters per seconds (CPS).
  10. 10. Chapter 02 Input Output Memory Devices Introduction to output devices: Characteristics of Non-impact printers ➢They are quiet than impact printers because there is no striking mechanism involved. ➢They posses the ability to change type faces automatically. ➢These printers produce high quality graphics. ➢These printers support the transparencies.
  11. 11. Chapter 02 Input Output Memory Devices Introduction to output devices: Characteristics of Non-impact printers ➢These printers cannot print multi part forms because no impact is being made on the paper. ➢Measured in dots per inches (dpi) ➢The speed is calculated by the number of pages per minute (ppm) ➢The size of the printing various A4,A3,A2,A0 and Jumbo size.
  12. 12. Chapter 02 Input Output Memory Devices Introduction to output devices: Line printer: -Capable of printing an entire line at a time. -It can print 150 lines to 3000 lines per minute. -The limitations of line printer are they can print only one font, they cannot print graphics. -The print quality is low and they are noisy to operate. -It is used to print on multi part stationeries to prepare copies of a document.
  13. 13. Chapter 02 Input Output Memory Devices Introduction to output devices: Dot Matrix Printer: -It prints one line of 8 or 14 points at a time, with print head moving across a line. -The printing speed is around 300 characters per second. -It uses multi part stationeries to prepare copies of a document.
  14. 14. Chapter 02 Input Output Memory Devices Introduction to output devices: Thermal Printer: -Printers that produce images by pushing electrically heated pins against special heat-sensitive paper. -Thermal printer paper tends to darken over time due to sunlight and heat. So the printed matters on the paper fade after a week or two. -It produces poor quality print.
  15. 15. Chapter 02 Input Output Memory Devices Introduction to output devices: Laser Printer: -laser printers use a laser beam and dry powdered ink to produce a fine dot matrix pattern. -It can produce very good quality of graphic images. -The available resolution range from 300dpi at the low end to around 1200 dpi at the high end.
  16. 16. Chapter 02 Input Output Memory Devices Introduction to output devices: Inkjet Printer: -it uses color cartridges which combine magenta, yellow and cyan inks. A black cartridge is also used for crisp monochrome output. -Inkjet printers work by spraying ionizing ink at a sheet of paper. -magnetized plates in the ink’s path direct the ink onto the paper in the described shape.
  17. 17. Chapter 02 Input Output Memory Devices Introduction to output devices: Plotter Printer: -plotters use pens to draw lines. As a result, they can produce continuous lines, whereas printers can only simulates lines by printing a closely spaced series of dots. -Plotters are more expensive than printers. -They are used in engineering applications where precision is mandatory.
  18. 18. Chapter 02 Input Output Memory Devices Introduction to output devices: Speakers: -The sound signals from analog/digital are converted into audible frequency in the speakers and produce voice output. -Using speakers along with speech synthesizer software, the computer can provide voice output. -voice output has become very common in many places like airline, banks, automatic telephonic enquiry system etc. -Users can also hear music/songs using the voice output system. -Today the speakers are with the subwoofer and 2/3/4 speakers.
  19. 19. Chapter 02 Input Output Memory Devices Introduction to Memory devices:
  20. 20. Chapter 02 Input Output Memory Devices Introduction to Memory devices:
  21. 21. Chapter 02 Input Output Memory Devices Introduction to Memory devices: Secondary memory: Hard Disk Drive (HDD) Storage capacity= number of tracks*number of sectors*bytes per sector*number of read/write heads
  22. 22. Chapter 02 Input Output Memory Devices Introduction to Memory devices: Secondary memory: Floppy Disk Drive (FDD) 3.5” floppy disk Storage capacity: 1.44 MB 5.25” floppy disk Storage capacity: 11.2 MB
  23. 23. Chapter 02 Input Output Memory Devices Introduction to Memory devices: Secondary memory: Portable storage device (PSD)
  24. 24. Chapter 02 Input Output Memory Devices Introduction to Memory devices: Cache memory: is a small amount of high speed memory, present between the primary memory and CPU. There are two types of Cache memory: L1 and L2.

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