This document discusses various input, output, and memory devices. It describes different types of keyboards, mice, joysticks, and optical mark recognition devices as examples of input devices. As output devices it examines monitors, printers including impact, non-impact, inkjet, laser, and thermal printers, as well as plotters and speakers. It also discusses hard disk drives, floppy disk drives, and portable storage devices as examples of secondary memory and how cache memory works.

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.