These 1980s computer books are great and have been discussed in past HN threads.
The most striking about these books: they are more readable and enjoyable than many programming and computing books published for adults today.
The books use illustrations extensively to explain concepts, and the layouts are varied and lively to keep readers attentive. (Compare to the stranglehold of markdown for any technical documentation).
Not only are these Usborne books well-written with clear, concise explanations, they are also excellent source for inspiration and ideas for anyone writing a technical guide, tutorial or book.