The book, Introduction to Computer Memory Systems, was written to try and solve some of the problems faced by students in computer science, computer engineering and information systems programs. In most developing countries, there is a scarcity of simply written and affordable books on information technology. The author of this book is a lecturer with many years of lecturing at universities and is aware of the problems faced by the students studying information and communications technology. The computer memory is one of the basic components of the computer system and it is really important to know how the memory system operates to understand how a computer system operates.This book is organized in form of lectures in an easy to learn and understand fashion.