lecture 6

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Information Technology for Managers:

Information Technology for Managers Session 4 By Arun Mishra

Learning Objectives:

Learning Objectives In this session you will learn about: Types of Input Devices Functions of Input devices. Types of Output devices. Functions of output devices.

Input-Output Devices:

Input-Output Devices

Input Devices:

Input Devices

Slide 5:

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 the original standard of 101 keys to the 104-key windows keyboards Types of keyboards General Purpose keyboard Special Purpose Keyboard

Slide 6:

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 Mechanical Mouse Optical Mouse

Mechanical Mouse :

Mechanical 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.

Optical Mouse:

Optical 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 a mechanical mouse as well as over almost any surface other than glass or mirror.

Data Scanning Devices:

Data Scanning Devices

Image Scanner:

Image Scanner

Types of Image Scanner:

Types of Image Scanner

Types of Image Scanner:

Types of Image Scanner

Types of Image Scanner:

Types of Image Scanner Optical Character Recognition (OCR) Optical Mark Reader (OMR). Bar-code Reader Magnetic Ink Character Reader (MICR)

Output Devices:

Output Devices



Slide 16:

Printer Peripheral device that produces outputs onto a sheet of paper. This paper is referred to as a hard copy.

Slide 17:

Dot Matrix Printer Inkjet Printer 3. Laser Printer Dot Matrix Printer Laser printer Inkjet Printer Types of Printers

Slide 18:

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-pin printers: 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.

Slide 19:

Dot Matrix Printer

Slide 20:

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.

Slide 21:

Print head Print head stepper motor

Slide 22:

The majority of businesses use laser printers for demanding printing needs (speed, quantity, quality). Laser printers print one whole page at a time, and require RAM (more memory) to operate. Print quality is measured as dpi They are non-impact printers Most 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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