A very strange computer manual that I had and enjoyed as a kid is The Secret Guide to Computers. https://en.wikipedia.org/wiki/The_Secret_Guide_to_Computers ht

A very strange computer manual that I had and enjoyed as a kid is The Secret Guide to Computers. https://en.wikipedia.org/wiki/The_Secret_Guide_to_Computers https://en.wikipedia.org/wiki/The_Secret_Guide_to_Computers Weird illustrations and humor and pretty eclectic and very opinionated coverage, from hardware to different operating systems to CS concepts, and the author said you could call him at home for free tech support if you bought the book. (I never tried that part, though.)