TrackBall

Track Ball

A trackball is a specific style of computer mouse.User track the ball with his finger and arrow move the

on-screen.

Key Board

Key Board

Computer keyboards are similar to eletric-typewriter keyboards but contain additional keys.keyboard is use to enter data into a computer

facebook

INPUT Devices

INPUT Devices

An input device is any hardware component that allow you to enter data or instruction into a computer .most commonly used input devices are the key board,mouse,microphone ,scanner,digital camera,and PC video camera.

INPUT

INPUT

Everything that we give to the computer system through input devices called input.

Information Processing Cycle(I P C)

Information Processing Cycle(I P C)

Information processing cycle consists of a series of tasks or 

steps required to convert data into information .different steps of information processing cycle a
re as
 follows.

Information

Information 

The processed form of data is called  information.information conveys meaning and is useful to one or more people.

Characteristics Of a Computer

Characteristics Of a Computer

1.Speed 

A computer is a very fast device. It can perform in a few seconds the amount of work that a human being can do in an entire year.

2.Accuracy

The accuracy of computer is consistently high and the degree of accuarcy of a particular computer depends upon its design.

3.Dilligence

A computer is free from monotony,tiredness and  lack conentrations.it can do work for hours.

4.Versatillity

Veratility is one of the most wonderful things about the computer .it can do many types of work such as preparing result,bills,letters etc.

5.No IQ

A computer cannot take its own decision in this regard.

6.NO Feeling

Computer have no feeling and no instinct because they are machines. 

Non-Branded Computer

NoN-Branded Computer

These computer have no special name but these recognize with its technology like Pentium 1 or Pentium 4.They are normally assembled with different companies parts.They are cheap and less reliable machines.

PC's normally come in four sizes &shapes;

3/4 Desk Top PC

3/4 Tower PC 

3/4 Laptop PC

3/4 Palm Top Pc

Brand Computer

Brand Computer

These computer are asseemble or manufactured a company and marketed them with a spical name. For exam Ple IBM, APPLE, ACER, COMPAQ, HEWLLET PACKEDRD (HP),DELL and so on. These are high quality, high cost machines.

Introduction To Personal Computers

Introduction To Personal Computers 

Personal computer is also called Microcomputer  was designed be one person at a time.These are small in size and mainly used in Accounting, Database,Word Processing  and Speed Sheet Packages etc.
Intel Based  Microcomputer is of two Categories;


Old Series 8088,8086,80286,80486,80386,80486 and 80586


New Series  Pentium 1,Pentium II Pentium III,  Celron, Pentium 4,Pentium Core. 

Depending Upon Their Working Principle

Depending Upon Their Working Principle

(a) Analog Computer :

Such a type in computer i which input is given in the form of digits but output is receiving in graphical  form.. This out put in correct 90%(1.e. wall clock,Thermometer, Magnetic Needle etc.)

(b) Digital Computer

Digital computer  that in which input is given in the form of digits and output is also received in form of digit (Digital Watch,Calculate etc.)

(c)Hybrif Computer

There  computer  have both properties analog and digital. Hybrid Computer given output in both and graphs all PC are the Hybrid computer having both properties.

Classification Of Computer

                                       
                                                           Classifiication Of Computer

Computer  is  classified according  to their size,Technology  and the woking Principal into different categoriess. 

• Depending upon their size

• Depending upon working principal

• Depending upon Technology 

Depending Upon Their Size:

Super Computer :

Faster,Most powerful,

Computer  is  classified according  to their size,Technology  and the woking Principal into different categoriess. 

• Depending upon their size

• Depending upon working principal

• Depending upon Technology 

Depending Upon Their Size:

Super Computer :

F Most expensive, large in size and Memory,Multi -User. The first cray super Computer was introduced in 1976.

Mainframe Computer:

Less powerful than Super computer ,Large in size and memory ,Multi-User, Expensive.

Mini Computer:

less  powerful than Mainframe,Medium Sized,Multi-user,Expensive.

Micro Computer:

Single User ,powerful Enough,in expensive ,personal computer

Brief history of Computer

                                                           Brief  history of Computer  The abacus,shown in below,is a calculator;its first recorded use was circa 500 B.C. The Chine used it to add, subtract,multiply,and divide.

• In 17th century BLAISE PASCAL a mathematician and scientist of France developed the first mechanical calculator, which he called the "Pascalins".
• CHARLES BABBAGE a mathematician of UK in 1822 designed a special type of calculator called "differnce Engir.e"and in 1833 he developed a machine called "ANALYTICAL ENGINE".
• Later on American Scientists working at Howard University developed computer between 1937 and 1943 called"Howard mark-1".
• First electronic computer wa developed in 1946 at the University of Pennsylvania USA.
• First Personal (PC) was developed in 1981.