Contains all the information an experienced machine code programmer could need and will also be of great use to the Basic programmer. An excellent supplement to the Sinclair Manuals. Explains in simple terms just how the Spectrum works, teaches ZX80 Machine Code from first principles and has a special section on the ROM.
A must if you are serious about programming the Spectrum.
This 192 page paper back has certainly been well used and has a few scuff marks and a tear along the spine - it is however, completely usable and has no loose pages.