This book was current and hot in the mid-'70s, when I was new to computing, but had a ham radio license (so I knew a bit about basic electronics). It was like a grimoire or spell-book: each example made me say "Wow!" in a way no non-fiction book had or has, before or since. It made logic _real_. I even built TTL gizmos that were more advanced than the book's examples, simply because I learned enough from reading to be able to do so (and I was 15 years old at the time). It made me realize I _could_ turn ideas into hardware. It made me understand what "if/then" was all about. It gave me confidence. As another reviewer beautifully put it, "If I had not read this book, I don't think I would have succeeded as a programmer." Well said, bro'.