Jobs resigned as chairman of Apple Computer on Sept. 16, 1985, after losing a boardroom battle for control of the company with then-CEO John Sculley.
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On Sept. 16, 1997, Apple announced that Jobs had officially been named interim CEO, or — as the company cleverly put it — iCEO.
If you want a good look into Apple leading up to Jobs’ ousting, I would recommend you read West of Eden by Frank Rose. Fascinating stuff.