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The period of fourth generation was from 1971-1980. Computers of fourth generation used Very Large Scale Integrated (VLSI) circuits.

Fourth generation computers became more powerful, compact, reliable, and affordable. As a result, it gave rise to Personal Computer (PC) revolution. In this generation, time sharing, real time networks, distributed operating system were used. All the high-level languages like C, C++, DBASE etc., were used in this generation.

The main features of fourth generation are −

✔︎VLSI technology used
✔︎Very cheap
✔︎ Portable and reliable
✔︎ Use of PCs
✔︎ Very small size
✔︎ Pipeline processing
✔︎ No AC required
✔︎ Concept of internet was introduced
✔︎ Great developments in networks
✔︎ Computers became easily available

Some computers of this generation were −

✔︎ DEC 10
✔︎ STAR 1000
✔︎ PDP 11
✔︎ CRAY-1(Super Computer)
✔︎ CRAY-X-MP(Super Computer