The IGNOU MCS-202: Computer Organisation course is an integral part of the Post Graduate Diploma In Computer Applications (PGDCA) curriculum, designed to provide students with a comprehensive understanding of the internal structure, functioning, and principles of computer systems. This course covers critical topics such as computer architecture, data representation, instruction sets, memory systems, and input-output processing, all of which are essential for mastering the workings of a computer system.This book, IGNOU MCS-202: Computer Organisation Previous Years Unsolved Papers, serves as a valuable resource for students preparing for their examinations. It brings together a collection of unsolved question papers from previous years, allowing students to practice and assess their knowledge on a variety of topics. The unsolved format is aimed at promoting self-assessment and critical thinking, encouraging students to apply the concepts they have learned throughout the course.By engaging with these unsolved papers, students can explore key areas such as:Data representation and computer arithmeticProcessor organization and instruction setsMemory hierarchy, cache, and virtual memoryInput/output systems and interfacingAssembly language programmingControl unit design and pipeliningEach question paper is structured to mirror the real examination format, giving students an opportunity to familiarize themselves with the types of questions they may encounter. These unsolved papers challenge students to analyze and solve problems, helping them to reinforce their understanding of both theoretical concepts and practical applications.We hope this book proves to be a beneficial tool for students in their exam preparation and enhances their understanding of computer organization. It is our belief that diligent practice with these papers will enable students to succeed in their academic journey and equip them with the knowledge necessary for future endeavors in the field of computer science.We would like to express our gratitude to the students and educators who have contributed to the development of this book. Their insights and feedback have been invaluable in ensuring that this compilation meets the highest standards of academic excellence. As you embark on your journey through the world of algorithms, we hope that this book will be a reliable companion in your studies, helping you to unlock the full potential of your capabilities in the field of computer science.