and - i made similar comment with a bit more elaboration. it's important to realise this is how to make an OS from scratch in the 90s without any idea of what the OS is going to do or what hardware you want to run it on, etc. etc. - there are many things missing which will surely bite you, hard, if you want to roll an actual usable OS.

it's a lot of fun to do these things, but it's good not to be convinced it's actually how modern OSes work, or modern hardware for that matter.