It is a pity this book is difficult to locate these days, because it is still very relevant if you wish to build simple CMOS circuits, or indeed want to learn the basic theory of logic systems. Clearly written, with a wry sense of humour, I found it an invaluable bible when starting out making CMOS switching circuits. Lots of easy to find diagrams of chip pinouts, with graphic representations of the internal circuits. Good working examples of real-world applications described. Also vital information on the building of power supplies, decoupling, workarounds etc. I cannot praise this book enough. I have now mislaid my copy, which is why I'm searching for another! Thouroughly recommended.