OP, you should take a look at Casey Muratori's course at computerenhance.com The first part of the course's homework creates a simulator of the 1978 intel 8086

OP, you should take a look at Casey Muratori's course at computerenhance.com The first part of the course's homework creates a simulator of the 1978 intel 8086 (which modern x86_64 assembly still closely resembles). You will learn a lot of things about computers that are really difficult to find elsewhere.