What Really Differentiates Computer Architectures? Not Just System Calls

No, the biggest difference between computer architectures is not only the system calls implementation. Computer architecture refers to the design of the computer system, including the CPU, memory, and other components. It encompasses the instruction set architecture (ISA), which defines the set of instructions that the CPU can execute, as well as the memory hierarchy, input/output mechanisms, and other system components. The system calls implementation is just one aspect of the operating system that runs on top of the computer architecture. Other factors that can differ between computer architectures include the physical layout of components, the bus architecture, and the instruction pipeline design.