Apple Macintosh started on Motorola processors. Then they moved to PowerPC processors. Then they moved to Intel processors. And now they've moved to ARM processors. It's happened 4 times in the same product line.
2006 wasn't the first such transition Apple did, just the previous one. Their transitions from 68k to PPC and from classic MacOS to OS X were similar to the PPC to x86 and x86 to ARM transitions from an application compatibility standpoint.
Apple Macintosh started on Motorola processors. Then they moved to PowerPC processors. Then they moved to Intel processors. And now they've moved to ARM processors. It's happened 4 times in the same product line.
https://jacobbartlett.substack.com/p/through-the-ages-apple-...