What are instruction set architectures?

Question

I know some examples are x96, x64 and arm. Are they abstract models of computation, like Turing machines?

In: 2

Answer 1

It’s a translation book. Every possible program instruction on the CPU has a translation into a binary code. The architecture is the whole collection of matched codes and instructions. If you try to use an x86 instruction guide programming for an x64 chip, your translations will be wrong and your program will not run correctly.