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I haven't read it, but I saw it on a friend's bookshelf:

Highly recommend it! As typical with Feynman's writing it is both enlightening and entertaining.

Fantastic book, discussed everything from the basics physics of logic gates/computational theory to quantum computers. With problems to match.

In some ways it's an introductory text, but written in a open and accessible way.

If I am not mistaken this book was based off of his lectures at Caltech in the 80s , right around the time he was thinking about quantum computing.