Introduction The Dataway defined in IEEE Std 583-1975@ Modular Instrumentation and Digital Interface System@ is the basis for all CAMC* system. It provides the means of interconnection between moudles and a crate controller with in one crate. This standard defines the CAMAC Parallel Highway Interface System for interconnecting up to seven CAMAC crates (or other devices) and a system controller. The Parallel Highway@ so called because the data bits are transmitted along the Highway in parallel@ is capable of handling higher data rates than nonparalled highways@ However@ in some applications@ for example@ where there are long distances between crates or where simplicity of interconnections is particularly important@ the Serial Highway of IEEE Std 595-1976@ Serial Highway Interface System (CAMAC)@ may be more suitable. *Computer Automated Measurement and Control