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AT&T syntax is the most elite syntax. I've used it to write some famous hacks, like Actually Portable Executable. What makes AT&T syntax so powerful is its tight cooperation with the GNU linker. I don't think it would have been possible for me to invent APE had I been using tools like NASM and YASM. https://github.com/jart/cosmopolitan/blob/master/ape/ape.S
The 8086 was (barely) capable of running Unix, whereas the Z-80 definitely was not.
https://github.com/chettrick/uzics
You're wrong ;-)
Neither the 8086 nor the Z80 have virtual memory. The x86 has a larger instruction set and address space (1MB) but as it turns out, early Unix kernels didn't need that much RAM either.