Chapter 02 Input Output Memory Devices

1. Chapter 02 Input Output Memory Devices
Input Devices
Keyboard:

2. Chapter 02 Input Output Memory Devices
Input Devices
Types of Keyboard:
➢Standard
➢Ergonomic
➢Wireless
➢Virtual
➢Compact

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. Chapter 02 Input Output Memory Devices
Input Devices
Joystick:

5. Chapter 02 Input Output Memory Devices
Input Devices
OMR, OCR AND MICR:

6. Chapter 02 Input Output Memory Devices
Introduction to output devices:
Monitors
CRT monitor
LCD monitor
TFT monitor
LED monitor

7. Chapter 02 Input Output Memory Devices
Introduction to output devices:
PRINTERS
IMPACT
LINE
PRINTER
DOT
MATRIX
NON-IMPACT
INKJET LASER THERMAL

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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. Chapter 02 Input Output Memory Devices
Introduction to Memory devices:

20. Chapter 02 Input Output Memory Devices
Introduction to Memory devices:

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. 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. Chapter 02 Input Output Memory Devices
Introduction to Memory devices:
Secondary memory: Portable storage device
(PSD)

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.