Ask HN: Do you happens to know the website/course which I losted the URL?

Hello HN, I'm looking for a website that got posted here, which is a thorough (multi-page responsive html) guide of fondamental CS Courses starting from binary/decimal conversion, 8 bits CPUs architecture, and C programs compiler. It got something like 400 upvotes 1 year ago I think but I can't find it and I haven't saved the URL appart from my phone which stopped working.