It's not that you couldn't have, it's that you didn't. Although when I was 14, the references to do this were not readily available. With all credit to "Omar",

It's not that you couldn't have, it's that you didn't. Although when I was 14, the references to do this were not readily available. With all credit to "Omar", it's also credit to how available and intelligible our reference material is for techniques like this. Honestly though, writing OSs? People make it magic. In reality, they're just programs. It's fun. There are even really smooth (albeit way outdated) tutorials like NachOS out there (https://www.ida.liu.se/~TDDI12/material/begguide/ https://www.ida.liu.se/~TDDI12/material/begguide/)