The task of this book is not just to acquaint the reader with modern standards for serial and parallel interfaces, but to teach him to understand why this standard is exactly as it is and what useful and harmful properties (for this application) follow from each of its provisions. At the stage of choosing an architecture, it is important to understand the fundamental differences between interfaces from each other. Then, knowing the worthwhile task, the developer will be able to choose the most functional solutions. At the stage of developing electrical diagrams of nodes, the book will serve as a guide to interfaces and their application.