.....data is needed. Frank Byrne, who was involved in the planning for the Processing System from the start, took on the job of designing a device to keep track of commonly needed data that also made it possible for the various computers to communicate with each other. Kennedy followed a plan to use commercially available equipment in as many parts of the Launch Processing System as possible. Minicomputers and mainframe computers are used largely unchanged. However, since no organization had tried to closely connect such large numbers of machines, some of which were quite different in architecture from the others, there was no commercially available solution to the common data problem. Byrne had to design one on his own: the common data buffer.
....Honeywell's 4JS1 operating system, which is no longer supported by the company. One NASA computer scientist said that "we have taken almost every piece of standard software and modified it" to meet the unique needs of the Launch Processing System 112. Most often the first pair of Honeywells support an operations firing room, whereas the second set is being used for software development. If one of the pair notices that it has failed self-tests for 10 machine cycles, it automatically switches control to its partner.