NACHRICHTENVERMITTLUNGSSYSTEM

The system has duplicate central processors, each having its own bus. Subsystem modules include program memory, data base memory, status detector, register-senders, markers, etc., each having one or more memory word stores. Bus interface units of identical construction are interposed between the subsystem modules and the busses. Some modules such as program memory are duplicated and each connected to one bus, while others are connected via their interface unit to both busses. All memory addresses are accessed from a processor via its bus, each address being effective to select only one interface unit, and the complete address being then passed to the subsystem module to read or write a data word.