This book provides coverage of the Business and Technician Education council (BTEC) level NIII unit in Microprocessor Interfacing (syllabus U86/335). However, it can be regarded as a textbook in interfacing for a much wider range of studies. The text concentrates on the widely used 6502, Z80 and 6800/02 microprocessor families, details of which are contained in Heinemann's Checkbook Series, Microelectronic Systems NII/NIII. Basic details of typical interfacing devices for each of these microprocessors are included in the text.