Book covers the entire syllabus for Module-6, Computer Organization and Operating System in a clear and simple style. It presents a detailed discussion on the basic structure of computers, Arithmetic Operations and Instructions; with various components of a computer and their function. It also discusses logic gates, binary arithmetic and types of Instructions.

I/O organization, memory organizations are some of the hardware features of a computer which are evolving every day. Concepts behind these systems are covered with the help of a number of diagrams with simple explanations.

In addition, basics of Linux file system, Process management, Shell features, Standard input/output, Piping and Processing tools are discussed in such a manner that students of all streams namely arts, commerce and science can easily understand such complex subjects without any difficulty.


Based on NIELIT ‘A’ Level Revised and Latest Syllabus for Module 6 (A6-R5)


  • A comprehensive glossary is added for easy access to numerous terms needed for understanding the subject matter.
  • Set of review questions with answers are added at the end of each chapter.
  • A set of solved and unsolved papers are also included to enable the readers to get a feel of the questions likely to be asked in the examination.


  • Structure of Computers and its Arithmetic Operations
  • Central Processing Unit, Instructions
  • Memory Organization, I/O Organization
  • Operating Systems, Linux Basics


Students, Programmers, researchers, and software developers who wish to learn the Computer Organization and Operating System.