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A comment on How to make a CPU – a simple picture-based explanation. Parent comment

Re:How to make a CPU – a simple picture-based explanation by kens on Wednesday November 10, 2021 @11:25PM (#29184414)
No, Sam Zeloof started from blank silicon wafers and did four layers of photolithography to produce PMOS gates. He used boric acid for the boron diffusion. He sputtered an aluminum layer on top for the metal and etched it with phosphoric acid.

http://sam.zeloof.xyz/first-ic/

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