Digital computer systems consist of a central processor unit accompanied by peripheral devices which input, output, transfer and store data and information. In the design of many systems, the function and use of peripherals, such as printers, disc drives and mice, can be more important than the particular microprocessor employed. With its descriptions of all the major peripherals, how they work, and how they communicate with the computer and each other, this text will be of interest to anybody who comes into contact with computers. This new edition places greater emphasis on the use of peripherals with microcomputers and has been thoroughly revised to include many new and developing devices. It assumes no special academic or technical background, and emphasizes the underlying principles of operation rather than being product specific.