This book will be a valuable asset to all Spectrum owners. There is a wealth of material enabling you to employ versatile techniques which are normally the domain of the professional. The author shows how short machine code routines can be written and used very easily. A number of programs which are ready to type in are also included.

For the machine code programmer, this book will be a constant source of reference. Instead of 're-inventing the wheel' for each new program, the author shows you how to make full use of ROM routines and the existing facilities.

Both the Spectrum and the microdrive interface are covered, and there is a detailed description of extending the operating system for microdrive users.