Transaction Management eXecutive

Transaction Management eXecutive, abbreviated TMX, was NCR Corporation's proprietary transaction processing system, running on NCR Tower 5000-series machines built on Motorola 680xx processors. It was used mainly by financial institutions in the 1980s and 1990s. TMX was a multiuser, multitasking 32-bit operating system with a flat file system that had no subdirectories, and it ran a proprietary network called LBN, the Local Branch Network, with Token Ring support added in later versions. It supported devices common in banking, including NCR terminals, passbook printers, cash dispensers, magnetic stripe readers and pinpads, and offered SNA LU emulations for mainframe connectivity. Its main programming language was Whitesmiths C, and the Tower 5000 machines could also run UNIX SVR3.