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11

Information Technology for 

Managers

Information Technology for 

ManagersSession 4

By

Arun Mishra

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Learning ObjectivesLearning Objectives

In this session you will learn about:

• Types of Input Devices

• Functions of Input devices.• Types of Output devices.

• Functions of output devices.

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Input-Output DevicesInput-Output Devices

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Input DevicesInput Devices

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Keyboard

• Keyboards are designed for the input of text and

characters and also to control the operation of a

computer.

• The number of keys on a keyboard varies from theoriginal standard of 101 keys to the 104-key windows

keyboards• Types of keyboards

• General Purpose keyboard• Special Purpose Keyboard

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Mouse

• A mouse (plural mice or mouses) functions as a pointing

device by detecting two-dimensional motion relative to its

supporting surface.

• Can be used only with GUI (Graphical user interface)

based OS. E.g. Windows.

• Types of mouse based on mechanism

1. Mechanical Mouse2. Optical Mouse

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Mechanical MouseMechanical Mouse

A mouse that uses a rubber ball that makes

contact with wheels inside the unit when it

is rolled on a pad or desktop.

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Optical MouseOptical Mouse

• A mouse that uses light to

detect movement.

• It emits a light and senses its

reflection as it is moved.• Early optical mice required a

special mouse pad, but today's

devices can be rolled over 

traditional pads like amechanical mouse as well as

over almost any surface other 

than glass or mirror.

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Data Scanning DevicesData Scanning Devices

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Image Scanner Image Scanner 

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Types of Image Scanner Types of Image Scanner 

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Types of Image Scanner Types of Image Scanner 

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Types of Image Scanner Types of Image Scanner 

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Types of Image Scanner Types of Image Scanner 

Optical Character Recognition (OCR)

Optical Mark Reader (OMR).Bar-code Reader 

Magnetic Ink Character Reader (MICR)

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Output DevicesOutput Devices

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MonitorsMonitors

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Printer 

Peripheral device thatproduces outputs onto asheet of paper. Thispaper is referred to as a

hard copy. 

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1.Dot Matrix Printer 

2. Inkjet Printer 

3. Laser Printer 

Dot Matrix Printer 

Laser printer 

Inkjet Printer 

Types of Printers

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Dot Matrix Printer 

• Also called Impact printers (parts actually impact the paper)

Fires  pins (or print wires) at an ink ribbon, which contacts the

paper and leaves a mark• The   print head , which contains the pins, moves left to right

across the paper, line by line, creating letters out of the circular dots of ink that have impacted the paper.

• Coils of wires called solenoids are energized, thus creating an

electromagnet, and cause the pins to shoot forward and strike

the ribbon.

• Print quality is measured in "pins", as in 9-pin, 24-pin, 48-pinprinters: number of pins in the print head.

• The speed of the printer is measured in cps, characters per 

second.• The paper most often used with dot matrix is continuous,

tractor-fed paper with perforated strips on the sides.

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Dot Matrix Printer 

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Inkjet Printer 

Inkjet printers use liquid ink-filled cartridges that force out

and spray ink at the page through tiny holes called

nozzles. The printer sprays ink at the page through pressure and

electricity. Normally, the pressure inside the ink cartridge (in the ink 

reservoir ) is a bit less than pressure outside. When the deflection plates are electrically charged, ink is

forced out. Inkjet printers can use plain paper and inkjet specific

paper (for higher print quality). Print quality is measured in dpi , dots per inch. Print speed is measured in ppm, pages per minute.

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Print head Print head stepper 

motor  

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The majority of businesses use laser printers for 

demanding printing needs (speed, quantity, quality).

Laser printers print one whole page at a time, andrequire RAM (more memory) to operate.

Print quality is measured as dpi

They are non-impact printersMost laser printers can print in black color only.

They can print many special characters, different sizes

of print, and graphics such as charts & graphs.

Laser Printer 

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