Transaction Management eXecutive

Transaction Management eXecutive or TMX was NCR Corporation's proprietary transaction processing system running on NCR Tower 5000-series systems which were based on Motorola 680xx CPUs. This system was used mainly by financial institutions in the 1980s and 1990s.
Features.
Basic features of the TMX operating system are listed below:
NCR Tower 5000 systems were also capable of running UNIX SVR3 version.