Friday 3 May 2013

Genrations of computer

First - Generation :-
 First-generation computers,starting with the UNI VAC I in 1951, used vacuum tubes  and their memories were made of thin tubes of liquid mercury and magnetic drums.

Second-Generation :-

Second-generation systems in the late 1950s replaced tubes with transistors and used magnetic cores for meomories.size was reduced and reliability was significantly improved.

Third-Generation :-

Third-generation computers,beginning in the mid-1960s,used the first integrated circuits and the first operating systems. online systems were widely developed,although most processing was still batch oriented,
using punched cards and magnetic tapes.

Fourth-Generation :-

The fourth-generation which start in the mid-1970s,brought us computers made entirely of chips.
it spawned the microprocessor and personal computer.it introduced distributed processing and office automation. for the first time,Query languages,report writers and spreadsheets put large number of people in touch with the computer.

Five-Generation :-

Fifth-generation computer are expected to combine very large-scale integration with sophisticated approaches to computing,including artificial intelligence and true  distributed processing.



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