https://ntrs.nasa.gov/api/citations/19670009662/downloads/19670009662.pdf https://ntrs.nasa.gov/api/citations/19670009662/downloads/19... “The data processing

https://ntrs.nasa.gov/api/citations/19670009662/downloads/19670009662.pdf https://ntrs.nasa.gov/api/citations/19670009662/downloads/19... “The data processing system selected for the Apollo remote sites is being manufactured and assembled by the UMVAC Military System, Division of the Sperry Rand Corporation, located in St. Paul, Minnesota. The computer is identified as the UNIVAC 642 B Modified and has been designed to meet military specification. There will be two identical computing subsystems installed on each of the sites of the Apollo Tracking Network. These subsystems are identical in every respect with the exception of the mission requirements which will be assigned to each subsystem. One computer subsystem will be used for the processing of telemetry data and will also provide a command processing back-up capability. The second computer subsystem will be used for the processing of command data and will also provide a telemetry processing back-up capability. The purpose of the back-up capability is to provide continuous operation for the remote site computing requirements should either computer malfunction during a critical period of the mission.”