FOURTH_GENERATION

FOURTH GENERATION OF COMPUTER(1975-1990)

          The fourth generation computer were developed during 1975 AD to 1990 AD.The present day computer are included in this generation .They used large scale intergrated circuits (LSI) and very large scale intergrated circuits(VLSI) known as microprocessor chip as electronic circuits .The first microprocessor called Inted 400 was developed by Intel corporation USA in 1971 AD. Its size is about 0.5 cm long and less than 0.05  cm thick .In this generation the use of microprocessor made computer very faster,capable of very high memory,small in size and less expensive than previous generation. Fourth generation computer used graphical devices and language interfaces to graphics system.

Features of fourth generation computer are:-

·        These computers used Large Scale Integration(LSI) and Very Large Scale Integration (VLSI) called microprocessor chips as electronic circuits.

·        They used semi-conductor memory like floppy disk,hard disk and magnetic tape for secondary storage .

·        Fourth generation computer are highly reliable and accurate.

·        Their operating speed was increased to Pico-seconds

·        Their size was reduced to micro computer such as desktop and laptop.

·        They can understand many high level language and they are user friendly.

Some example (model) of fourth generation computers and their manufactures are listed below:-

Model	Manufactured by
IBM PC	IBM
Apple/Macintosh micro computer	Apple
B7800	Burroughts
Cray X-MP	Cray