The crucial external document that lesson #3 references (and is all about) is now a dead link. Here's an archive - page 14 is where they point you: https://we

The crucial external document that lesson #3 references (and is all about) is now a dead link. Here's an archive - page 14 is where they point you: https://web.archive.org/web/20241112015613if_/https://www.cs.bham.ac.uk/~exr/lectures/opsys/10_11/lectures/os-dev.pdf https://web.archive.org/web/20241112015613if_/https://www.cs... But here's a more succinct explanation of the reason for the memory offset: https://stackoverflow.com/a/51996005 https://stackoverflow.com/a/51996005