When it comes to thinking about Apple Silicon, any industry insider will tell you that there is a long lead time attached to silicon development — meaning development of the chips inside the most modern devices today probably began several years ago.
Zoom out and think back 13 years to the first real Apple Silicon chip, the A4 processor Apple put inside the iPhone 4 in 2010. That early processor reflected major strategic decisions, including the 2008 purchase of PA Semi and its ongoing work with ARM, which still creates the reference designs Apple uses at the core of its own chips.
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Source:: Computerworld