A Computer is an electronic machine that accepts data from the user, process it and generate the desired output results.
Classification of computers
Computer can be classified based on their computing power
and speed.
- Super Computer
- Mainframe computer
- Micro computer
- personal computer
Super computer:
Super computer are the most powerful computers in terms of
speed of execution and storage capacity. Performance of a supercomputer is
measured in floating-point operations per second.
World’s fasted supercomputer: Tianhe 2
World’s second fasted supercomputer: Titan
Mainframe computer:
Mainframe computers are multi terminal computers which can be shared simultaneously by multiple
users. Mainframe computers are use mainly by large organizations for critical
applications and bulk data processing.
Microcomputer:
A microcomputer is a small, relatively inexpensive computer
with a microprocessor as its central processing unit. Microcomputers are very
widely used and rapidly gaining popularity.
Personal computer:
Personal computers are designed for used by a single person.
Mini-computer:
Minicomputers are desk sized machines used in medium scale
applications.
Generation of computers
First Generation
Main components: Vacuum tubes
Language: First generation language (Example- EDVAC, UNIVAC, ENIAC, EDSAC)
Second generation
Main components: Transistor (Example- PDP, PDPI)
Third generation
Main components: IC Chips
Language: BASIC, COBOL, FORTRAN (Example- IBM 307, PDP2)
Fourth generation
Main components: Microprocessors (large scale integrated cirtuits)
Language: CPP, SQL (Example- IBM 3090/600 series, CRAY2
Fifth generation
Main components: Artificial intelligence (Example- PARAM, TITAN)
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