NORAD had a series of warning and assessment systems that were not fully automated in the Cheyenne Mountain complex into the 1970s. In 1979, the Cheyenne Mountain Complex Improvements Program 427M system became fully operational. It was a consolidated Cheyenne Mountain Upgrade program for command center, space, ballistic missile, and space functions, developed using new software technology and designed for computers with large processing capacity. There were three major segments of the 427M system: the Communication System Segment (CSS), NORAD Computer System (NCS), and Space Computational Center (SCC). The 425L Command and Control System, Display Information Processor, Command Center Processing System, and other hardware were replaced by the NORAD Computer System (NCS). The new system was designed to centralize several databases, improve on-line display capabilities, and consolidate mission warning information processing and transmission. It was intended to have greater reliability and quicker early warning capability. The Command Center Processing System's original UNIVAC 1106, re-purposed for Mission Essential Back-up Capability (MEBU), was upgraded to the more robust UNIVAC 1100/42. The 427M system, intended to modernize systems and improve performance, was initially "wholly ineffective" and resulted in several failures of the Worldwide Military Command and Control System (WWMCCS) system.