CS403 is a course offered by Virtual University that focuses on the fundamentals of computer architecture and assembly language programming. The course is designed to give students an understanding of the basic principles of computer architecture, the organization of the CPU, and the programming of assembly language. The course covers a wide range of topics, including the basics of computer architecture, assembly language programming, memory hierarchy, input/output operations, interrupts, and system buses. The course also includes discussions on the role of compilers and interpreters in computer programming and the fundamentals of operating systems. The book for CS403 covers all the topics discussed in the course in a comprehensive and detailed manner. The book is divided into several chapters, each of which covers a specific topic related to computer architecture and assembly language programming. The chapters are well-organized, and each topic is presented in a clear and concise manner, making it easy for students to understand the concepts and principles. The book includes numerous examples, exercises, and problems that help students to apply the concepts and principles learned in the course. The exercises and problems are designed to challenge students and test their understanding of the material. The book also includes solutions to the exercises and problems, making it easy for students to check their work and learn from their mistakes. Overall, the book for CS403 is an excellent resource for students who are interested in learning about computer architecture and assembly language programming. It is well-written, comprehensive, and easy to understand, making it an ideal resource for both beginners and advanced learners.