A device driver is used in the UNIX system to control specific peripheral devices, such as floppy disks or cartridge tapes. This book deals exclusively with writing device driver software, allowing UNIX users to expand their system"s flexibility by creating their own device drivers for those not supported by the company marketing system. In clear language, it provides detailed examples of driver logic, development methods, special requirements and steps connecting device driver programs to a variety of systems. Numerous sample programs, and an appendix with program listings for all examples, are included.