The book by Andrew Tanenbaum, a world-famous information technology specialist, writer and teacher, now in its sixth edition, is devoted to the structural organization of a computer. It is based on the idea of a hierarchical structure in which each level performs a very specific function. As part of this unconventional approach, the digital logic level, instruction architecture level, operating system level, and assembly language level are described in detail. The book is intended for a wide range of readers: both students studying computer technology and those who are independently acquainted with computer architecture.