Could Apple hypothetically use their perpetual license to ARM to license the ISA to other manufacturers if they so desired? (not that they do now, but it could be a saving grace if Nvidia assimilated ARM fully).
I'm pretty sure they can't, but I also think there's no way in hell they'd do it if they could. It's not in Apple's DNA. Better for them if no one else has access to the instruction set. I bet they'd make a completely custom ISA if they could. Heck, maybe they plan to some day, and that's why they're calling the new Mac processors "Apple Silicon".
- "We changed from the 68K to PPC" "Agh!...fine"
- "We changed from PPC to x86" "What, again?"
- "We changed from x86 to Apple Silicon" "...oooo...kay..."
- "We changed from Apple Silicon to, uh, Apple Silicon - like it's still called Apple Silicon, but the architecture is different" "What's an architecture?" "The CPU ISA." "The CPU is a what?"