I have come across the following sites and they are good places to start when you are looking for more free information about Tandem products, like their technical documentation, specifications, uses, ordering information, et al.

Please note that everything is provided here on an as-is basis, and the author does not accept any liability, whatsoever. Though your comments may help make things better.

• HP's NonStop Computing Home Page

• 24 x 7 - the magazine of the NonStop world - Archives

• NonStop Servers Publications

• NonStop Servers Newsletters

• HP NonStop Servers Evolution

• HP NonStop Servers K-series to S-series Migration Guide

• HP NonStop Server Software Products

• Zero Latency Enterprise (ZLE) Home Page

• HP NonStop Security Products and Security News

• HP NonStop Technical Documentation (NTL) Home Page (Recommended)

The PDF based documentation, containing all you may want to know about the HP NonStop servers, that was once another product called TIM (Total Information Manager)

• HP NonStop Servers Education Home Page

• HP NonStop Servers Certification Home Page

• Tandem Technical Reports (Recommended)
  Highly technical documentation and research reports generated from the research labs of Tandem