There are a huge number of system programming books. You can also search for system programming topics on HN.

There is probably still a lot out there but with the current state of the ('free') search engines you won't find much. I am painfully reminded of that every time I have to look for a datasheet that is not in my own archive yet.

At least part of the problem is that deep technical content doesn't get upvotes. The next time you see a link to such, note the vote count. It will be small. Note the vote count on some "AI" boosting link. It will be large. Is this Anthropic, Google and OpenAI bots for is it genuine interest?

rss

lobste.rs has some stuff