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Quality Nonstop Solutions
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Largest Reseller of HP Nonstop Hardware
Image of nonstop servers

Image of nonstop servers

Image of nonstop servers


Castle Systems, Inc. is the industry leader in Hewlett Packard NonStop hardware sales. We specialize in the purchase and resale of HP NonStop (Tandem) systems and peripherals. Working directly with the customer, we analyze requirements & customize solutions to provide the most affordable and effective hardware upgrades.
All hardware that we sell is:
  • The highest quality at significant savings.
  • Meticulously refurbished and tested by our trained technicians.
  • Comes with a 30 day warranty.
  • Guaranteed to be acceptable for your HP maintenance contract.
"Quality is never an accident; it is always the result of high intention, sincere effort, intelligent direction and skillful execution; it represents the wise choice of many alternatives."     William A. Foster

A long history of service

Castle Systems, Inc. has been serving customer worldwide since 1994. With over sixty years of combined specialization in HP NonStop solutions, we are the foremost professionals in the NonStop platform. Over the past two decades our exceptional service and relentless commitment to the needs of our customers has made Castle Systems a proven industry leader in the Tandem NonStop market.

"The goal as a company is to have customer service that is not just the best but legendary."     Sam Walton

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