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 Mehran University College Of Engineeirng And
Technology Kkaripur Mir’s
 Name:- Gul Nawaz Khan Mahar
 Roll No:- 12K-EL 17, 12K-EL 01, 12K-EL 03,52
 Assignment:- Computer & E-Learning
 Lecturer:- Engineer Ehsanullah Memon
 Last date of submission:- 03-3-2012
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
Overview
 Types of computer:1. Analogue computer
2. Digital computer
3. Hybrid computer
 Classes of computer:1.
2.
3.
4.
5.
6.
Desktop pc
Workstation pc
Notebook pc
Tablet pc
Handheld pc
Smart phones
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 INTRODUCTION TO TYPES OF COMPUTER: Computer are available in different shapes, size and weights,
 They perform different sort of jobs
 All the computers are designed by the qualified architectures
as per requirement of users

Computers have many types

But Basic three types are as under:-
1. Analogue computer
2. Digital computer
3. Hybrid computer
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Analog
Computer
Digital
Computer
Hybrid
Computer
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
Analogue computer:-

It uses the analogue signals

Contineous varing voltage

In contrast, digital computers work on numerical values called digits

Analog computers have been built using mechanical, hydraulic, optical
and electric principles

Used to measure values and other required operations like
temperature & volume

Had elecrtical provlems and limitaions

Use of Analog computers is almost obsolete now
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Analogue computers
Contineously varing voltage
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 Digital Computer: Stores data in terms of digits (numbers)
 Data is represented by 1 and 0 (0=OFF, 1=ON)
 High speed and aren’t affected by atmosphere
 In digital computers, even letters, words and whole texts are
represented digitally
 Usually in the binary number system
 circuits perform directly methamatical operations addition,
substraction, division, and multiplication
 A digital computer can store the results of its calculations for
later use
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Digital computers
Digital signals showing ON
and OFF position
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 Hybrid computer: Has both qualities i.e analogue and digital
 contains convertes which converts analogue signals to digital and vise
versa
 Digital component normally serves as the controller
 Analogue component normally serves as a solver
 Accepts analog signals, converts them to digital
 So also known as analog-digital computer
 Hybrid computers measures discrete values (digital)
 Changes continuously in magnitude (analog)
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Hybrid computers
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Classes Of Computer: Introduction: Classification of computers can be determined only by computer’s
Size & Power
 Computers are classified in six models given below
1. Desktop pc
2.
Workstation pc
3.
Notebook pc
4.
Tablet pc
5.
Hand Held pc
6.
Smart Phones
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 Desktop pc: Two designs Horizontal (desktop) and Vertical (tower)
 Used for communication, produce music, graphics, video etc
 Desktop computers are usually less expensive than laptops
 Most desktops offer more power, storage and versatility
 Mostlay suitable for office and home usage
 Desktop computers have generally limited editions comparing to Tower
 Can be connected to local and wide area network for internet access
 wide range of high performance desktop pcs’ are now available
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Tower Model
Desktop Model
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 Work station pc: More powerful than desktop pc
 Large high resolution monitors and accelerated graphics
 More powerful processor, additional memory
 Ehanced capabilities for performing a special group of task
 Specially used for 3D Graphics or game development
 Most sound editors use workstation computers for sound editing
 Like personal computers, most workstations are single-user computers
 workstations are typically linked together to form a local area network
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Work station pcs
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 Notebook pc: Size can be 8.5 to 11 inches are called Laptops
 They need batteries for power
 Laptops are portable computers that integrate the display, keyboard, a
pointing device or trackball
 Processor, memory and hard drive all in a battery-operated
 Slightly larger than an average hardcover book
 It is designed for mobility, miniaturized technology
 Made for low power consumption
 But significantly more expensive than desktop systems
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Notebook pcs
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 Tablet pc: Tablet PC or slate-shaped mobile computer
 Equipped with a touch screen type of notebook
 Same functions as notebook pc but have pen
 Special-purpose pen called Stylus
 The handwriting is digitized and can be converted to standard text
 The tablet PC relies on digital ink (technology that digitally represents
handwriting in its natural form)
 Create an electromagnetic field below LCD that can capture the
movement of the pen
 Its effect is like writing on paper with liquid ink
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Tablet pcs
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 Hand Held pc: Computing devices, small enough to held in hand
 Called personal digital assistant(PDA)
 Applications are taking notes, displaying telephone numbers
 It can be connected to large phones
 Most PDA come with touch screen
 Access the internet through wireless connection
 Offer features like, cameras, music players, global positioning system
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Handheld pcs
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 Smart phones pc: Simply a phone with advanced features like e-mail, Internet and e-book
 Reader capabilities and built-in keyboard
 It is a miniature computer that has phone capability
 Smart cell phone is a mobile phone
 Advanced capabilities, often with PC-like functionality and can work PCMobile handset conversion
 Have a lot of verity in it
 Used frequently all over the globe
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Smart phones
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