[cestith]

Just within Mac they've gone from 680x0 to PowerPC (related to POWER but separate), to AMD64, to Apple Silicon. Before the Mac, they also had the 6502 and 6800 platforms.

[dwaite]

They went 32 bit x86 before adding support for amd64 bit and then eliminating 32 bit right before going to apple silicon (presumably in part motivated by rosetta 2 being optimized for translating amd64 software)

[cestith]

You're right. I'd forgotten about that. I haven't forgotten about the weird 64-bit-CPU-with-32-bit-EFI snafu, though. That was a pain.

[bayindirh]

However, as far as I can remember, they didn’t had to make a transition plan like they did in Intel transition.

They had to research how to make it completely seamless that time, for the first time.