The IEEE approved STE bus is the newest bus standard to be introduced to ensure efficient and reliable communication between microprocessors and related devices. After introducing bus systems, the author gives a survey of buses. This is followed by detailed interfacing of slave devices to STE, with practical circuits. Other typical slave devices are then discussed. The various ways in which one or many microprocessors and other bus masters may be connected to STE are described. Testing, software, practical aspects of digital circuitry and technical requirements of the STE specification are then considered. Finally, algorithms for the design of sequential logic circuits are presented.