I'm trying to find a website I used in the early 2010s. It was a personal website, divided up like a book into chapters. It started with basic electromagnets and switches, and slowly built up to data storage and computers. It had lots of circuit diagrams and it was incredibly helpful to conceptualize how things work. Even though modern devices use transistors and such, seeing how in principle you could make a large, slow computer from very basic first principles was enlightening.
Does anyone have a link or archive of this website, or even know what it was called?