Tandem

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tandem

[′tan·dəm]
(aerospace engineering)
The fore and aft configuration used in boosted missiles, long-range ballistic missiles, and satellite vehicles; stages are stacked together in series and are discarded at burnout of the propellant for each stage.
(electricity)
Two-terminal pair networks are in tandem when the output terminals of one network are directly connected to the input terminals of the other network.

Tandem

(Tandem Computers Inc., Cupertino, CA) A former major manufacturer of fault-tolerant computers founded in 1974 by James Treybig and provider of the early 21st century technology for HP's enterprise computing strategy. Tandem was the first company to address the transaction processing (OLTP) market for online reservations and financial transfers by providing computers designed from the ground up for fault-tolerant operation. These computers are used in all the major banks, stock exchanges, credit card companies and ATM machines in the world.

Tandem's most significant product was its MIPS-based Himalaya series which ran the NonStop Kernel operating system, compatible with Tandem's Guardian OS. This platform lives on in the NonStop S-series servers from HP, which acquired Tandem's technology via Compaq in 2002. Compaq purchased Tandem in 1997. See ServerNet.


James Treybig
Treybig founded Tandem and was at its helm for more than 20 years. (Image courtesy of Tandem Computers Incorporated.)






NonStop Processing
Tandem was the first company to build fault-tolerant systems for the OLTP market. At the top is Tandem's first NonStop system in 1976. At the bottom is the K10000, a massively parallel server that can scale up to 4,000 processors. (Images courtesy of Tandem Computers Incorporated.)


NonStop Processing
Tandem was the first company to build fault-tolerant systems for the OLTP market. At the top is Tandem's first NonStop system in 1976. At the bottom is the K10000, a massively parallel server that can scale up to 4,000 processors. (Images courtesy of Tandem Computers Incorporated.)
References in periodicals archive ?
The deal will see Convoy Technologies, a subsidiary of the firm, purchase an undisclosed stake in Tandem Money, which is the holding company of Tandem Bank.
Caption: Figure 3: Current density versus voltage for the two subcells in tandem and tandem cell, for the thicknesses 0.64 [micro]m and 60.62 [micro]m of the [Cu.sub.2]O layer and the c-Si layer, respectively: [mathematical expression not reproducible].
LIKE many identical twins, Eleanor and Caitlin Bradbury have always done everything in tandem.
IN TANDEM: Ruth Maher and Gemma McHale take to the saddle for the Peddle it Pink charity bike ride Picture: JASON ROBERTS
"As we move toward alternative power sources," says Lanzon, "we are talking about integrated 'power cubes' instead of discrete powertrain assemblies." These units will be designed and developed in tandem, and--in some cases--use designs, materials, and processes currently foreign to powertrain design and development.
"We have made a point of working in tandem with school libraries for a half-century and of providing exceptional customer service and expertise in library collections development.