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COMPUTER - OVERVIEW

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                              Today’s world is an information-rich world and it has become a necessity for everyone to know about computers. A computer is an electronic data processing machine, which accepts and stores data input, processes the data input and generates the output in a required format.                   A computer consists of hardware and software. Hardware components describe the physical parts of the computer and software controls hardware and run the operating system, different programs & applications like Microsoft Paint, Microsoft word, Microsoft Excel, Tally, Adobe Photoshop, etc. The main features of this machine are: Speed:   It processes the data at a very high speed. Accuracy:   It produces results with 100% accuracy Diligence:  It never gets tired or bored from its work. Memory:  It has a huge storage capacity where information can be stored permanently for a long time. Versatility:  It can perform variety of jobs for t
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Types of Computer

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Generally, when we talk about computers, we mean a digital computer but in fact, the computer can be classified into three categories and they are: (1) Analog Computer   (2) Digital Computer  (3) Hybrid Computer (1) Analog Computer:          Analog computer measures and answers the questions by following the method of “HOW MUCH”. The input data is not a number, digit or character but infact a “PHYSICAL QUANTITY” like  mass,  acceleration,  temperature, speed ,  pressure etc. and which is always in  continuous form. Applications: These are especially designed for Industrial applications like Petroleum Refineries, Chemical Plants, Electronic Power Plants. Examples: Analog thermometer, Pressure gauge , speedometer, Electricity meter, Weighing machine, etc. (2) Digital Computer:      Digital computer counts and answers the questions by following the method of  “HOW MANY”. The input data is represented by number, characters and digits and which is always
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Generation of Computers

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First Generation Computers Computer Characteristics & Capabilities 1 Size Size was equivalent to a room. 2 Density One component per circuit. 3 Speed Hundred instructions per second. 4 Reliability Failure of circuit in hours. 5 Memory Thousands capacity in characters. 6 Cost Cost was very high. 7 Language Machine language. Trends and Development in computer Hardware 8 Main Component Vacuum Tubes were the main components. 9 Main Memory Magnetic drum. 10 Secondary Storage Magnetic drum & Magnetic tape. 11 Input Media Punched cards & paper tape. 12 Output Media Punched cards & Printed reports. 13 Examples IBM 700, IBM 701 , IBM 704, IBM 709 , EDVIC, UNIVAC, M
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