National CSS, Inc. (NCSS) was a time-sharing firm in the 1960–80s, until its acquisition by Dun & Bradstreet in 1979. NCSS was originally headquartered in Norwalk, Connecticut, but relocated to Wilton in 1978. Sales offices, data centers, and development facilities were located at various sites throughout the U.S. Some additional sales offices were active in the UK and elsewhere.
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National CSS in the context of Tymshare
Tymshare, Inc was a time-sharing service and third-party hardware maintenance company. Competing with companies such as CompuServe, Service Bureau Corporation and National CSS. Tymshare developed and acquired various technologies, such as data networking, electronic data interchange (EDI), credit card and payment processing, and database technology. It was headquartered in Cupertino in California, from 1964 to 1984.
In 1984, Tymshare was acquired by McDonnell Douglas, to which Tymshare had sold its hospital accounting service in 1982. Tymshare was restructured, split up and portions were resold, spun off, and merged with other companies from 1984 through 2004 when most of its legacy network was eventually shut down. Islands of its network technology continued as part of EDI, into 2008.
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