There's a follow up post and there was supposed to be another one too but apparently was never written. Regarding code:

>Once I return to work and get approval to open up the source code, I’ll make the repo public as well.

Guess approval wasn't given?

Crazy his job allegedly owned his hobby project code

Unfortunately, this is not uncommon. Check the agreements you signed with your current employer. You might be surprised.

If you want more detail, may I suggest "The MS-DOS Encyclopedia" by Ray Duncan [0].

[0]: https://archive.org/details/The_MS-DOS_Encyclopedia_Ray_Dunc...

Yep, I thought so too! It’s a very interesting and fun topic.

So… I cannot resist redirecting you to a set of articles I wrote about two years ago on DOS and memory management, which I think covers some of the basic parts. The first one is https://open.substack.com/pub/blogsystem5/p/from-0-to-1-mb-i...