Computer Systems, Second Edition provides students with a broad understanding of all levels of computer systems. This book allows students to explore several levels, such as high-level language, machine, assembly, and the gate logic through top-down approach. Computer Systems, Second Edition includes the core topics in a category Architecture and Organization of the ACM and IEEE Computer Science Curriculum 2001 guidelines. Architecture and Organization (AR) core area of the initial report, along with the chapters of this text covering their respective regions, the AR1. Assembly level machine organization - Chapters 4, 5, 6, AR4. Memory system organization and architecture - Chapter 9, AR5.