Each processor has its own instruction set and thus assembly. Further, there are various assembly syntax dialects that can fall in and out of use. For example,

Each processor has its own instruction set and thus assembly. Further, there are various assembly syntax dialects that can fall in and out of use. For example, the AT&T syntax and Intel syntax used for x86: https://en.m.wikipedia.org/wiki/X86_assembly_language#Syntax https://en.m.wikipedia.org/wiki/X86_assembly_language#Syntax