You also need to define the system when talking about assembly, I think this is more relevant than the difference between architecture variants. I would recomme

You also need to define the system when talking about assembly, I think this is more relevant than the difference between architecture variants. I would recommend Linux because available documentation. Without doing any system specific syscalls and learning about calling conventions you won't get very far. https://github.com/torvalds/linux/blob/master/arch/x86/entry/syscalls/syscall_64.tbl https://github.com/torvalds/linux/blob/master/arch/x86/entry... (subject to change, see your specific kernel source) I think more fun is doing assembly on a µC without OS with some interesting peripherals and many MCUs have an instruction set inspired by x86.