This text book provides an introductory course in digital design and computer design. VHDL is used throughout the book to generate most of the designs in the book. No prerequisite is required for this book. The book is intended for students enrolled in electrical engineering , computer engineering, and computer science in their freshman or sophomore year. The first half of the book (Chapters 1 through 9) concentrates on digital design and the second half of the book (Chapters 10 through 19) concentrates on computer design and assembly language programming.