What are the major development that took place in the fourth generation of computer

I'm going to assume they're talking about VLSI circuits. It allowed more transistors and circuits on a single chip. Made computers better in every way.

Computers of fourth generation used Very Large Scale Integrated (VLSI) circuits. VLSI circuits having about 5000 transistors and other circuit elements with their associated circuits on a single chip made it possible to have microcomputers of fourth generation.

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