Assembly language is the fastest and most powerful language available for any computer. It can access ALL of a machines features, and it avoids the restrictions of higher-level languages such as Pascal and BASIC. Programs demanding speed or flexibility, such as graphics routines, word processors, and spreadsheets, are best written in assembly language.
This book is one of the classics of computing, for somewhere deep inside the dark mysterious silicone pathways of the "modern" computer there still exists the assembly language, direct contact to the inner workings of the computer, incredibly powerful and for evil computer villians like me knowing assembly language reassures me that if need be I can still give my stubborn misguided (by microsoft) computer a labotamy! Hahahahahahaha.....