Code, by Petzold. Not exactly eye-opening, I sort of knew most of the content, but I don't remember ever having such joy while reading a technical book. Before

Code, by Petzold. Not exactly eye-opening, I sort of knew most of the content, but I don't remember ever having such joy while reading a technical book. Before or since. I read the whole thing in a holiday (it's a big book, 500 pages or more IIRC), and I am a terrible reader. I was at a place with no internet, so that surely helped a lot.