This series has been designed for students seeking technician or equivalent qualification through the courses of the Business and Technician Education Council (BTEC) or similar international body. Each book in the series uses problems and worked examples to establish and exemplify the theory contained in technical syllabuses. This textbook aims to provide a foundation in various hardware and software techniques, along with additional material on basic ideas of systems, logic functions and numbering systems. The text concentrates on the popular 6502, Z80 and 6800 microprocessors and contains approximately 80 tested programmes which may be used with little or no modification on most systems based on these microprocessors. Each chapter consists of main points, worked problems and further problems.