Computer is a great invention of science .It was invented by Charles Babbage and also know as father of computers.The term "computer" was first introduced in 1613.Now-a-days we use computer in every field of our life .
Computer is a general purpose device that can be programmed to carry out a set of arithmetic and logical operations automatically .Modified define of computer is " an electronic device that manipulate information ,or data (store ,retrieve or process data ).The computer or classified on the basic of their generation .there are divided into 5 generation .
First generation(1942-55)
Third generation(1964-75)
Computer is a general purpose device that can be programmed to carry out a set of arithmetic and logical operations automatically .Modified define of computer is " an electronic device that manipulate information ,or data (store ,retrieve or process data ).The computer or classified on the basic of their generation .there are divided into 5 generation .
First generation(1942-55)
- They are the fastest calculating devices of their time .
- Bulky in size because they used thousands of vacuum tubes .
- generate lot of heat and also consume lot of power .
- Their hardware failed frequently because of the failure of vacuum tube .
- In this generation transistor replaced the vacuum tube .
- transistors made them 10 times faster than 1st generation computer .
- kept in air -conditional room .
- larger and faster primary and secondary memories .
- they used batch operating system
- use programming language (FOR TAN,COBOL,ALGOL...)
Third generation(1964-75)
- smaller in size
- kept in air conditioner rooms
- consume less power
- more reliable , need less maintenance .
- larger and faster primary and secondary memories .
- their production was cheaper and easier .
- there software were portable and use time-sharing operating systems.
- they support on-line computing
- Minicomputers were introduced
- scientific and commercial use
- personal computer (PC) were smaller
- no need of air-conditional (no ac for PC).
- less power consuming
- much faster and bigger primary and secondary memory
- used GUI(graphical user interface)
- used in offices and home computing
- low price ,affordable by individual ownership
- they were networked so allowed distributed computing
- portable PC(notebook and laptops)
- more faster mainframe computers.
- consume optimal power
- Internet based computing
- more user friendly
- very versatile as they can be used in every walk of the life .
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