Fouth Generation of mordern computer (1975 - 1989)
The period of fourth generation was 1971-1980.The fourth generation computers were made using very large scale integration technology. Tens of thousands of components were packed on a single chip, the size of a fingernail. It led to the development of microprocessor. Magnetic core memories were replaced by semiconductor memories. Personal computer operating systems were developed during this period.
Graphic User Interface (GUI) technology was exploited to offer more comfort to users. PCs became more affordable and widespread during this period.

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