IEEE Spectrum has created the Chip Hall of Fame that showcases the 25 chips that changed the world. The some of my favorite chips are the Fairchild Semiconductor u742 op-amp and the Zilog Z80 microprocessor.
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Fairchild Semiconductor u742 op-amp
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Zilog Z80 microprocessor
Fairchild Semiconductor u742 op-amp
Zilog Z80 microprocessor