That wasn't their first processor change, either. Not even was it first in the Mac line. The Apple I and II were MOS 6502 machines except for the Apple IIgs wh

That wasn't their first processor change, either. Not even was it first in the Mac line. The Apple I and II were MOS 6502 machines except for the Apple IIgs which was a 65c816. Then the early Macs were 680x0 machines. Then PowerPC. Then Intel. They looked at Intel chips for the iPhone and settled on Arm before launch. I wouldn't be surprised if some very brittle, early development version of iOS was running on an Intel mobile platform at some point.