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Intel, owns x86, AMD owns AMD 64. So to manufacturer a compatible x86-A64 CPU you would need to get licence.
Which they won't give you since they don't want competition.
There is a 3rd x86 license out there that was owned by Cyrix who was purchased by VIA and now Co owned by a Chinese company.
https://en.wikipedia.org/wiki/Zhaoxin
Intel and HP CO created IA64, and Apple, IBM, and Motorola Co created the Power architecture.
Part of why arm is used in everything is they license the crap out of it. And RISC V is fully open not requiring any license which is why it's rapidly growing in popularity.
I keep watching RISC, running a lot of ARM stuff now expecially with Pis using it, but getting out of the licensing mess altogether seems like what we should all be aiming for. Plus it's getting more advanced, and there are more things compiled for it, even RISC repos for distros designed to run on the chips.
I miss SPARC
DEC Alpha was massive at the time too - never really took off though.