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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Tandem

Tandem Computers was a major manufacturer of fault-tolerant computers founded in 1974 by James Treybig. It was the first company to address the transaction processing (OLTP) market for online reservations and financial transfers. Tandem computers were designed from the ground up for fault-tolerant operation in banks, stock exchanges, credit card companies and ATM machines. The company's most significant product was its MIPS-based Himalaya series that ran Tandem's Guardian OS and NonStop kernel.

In 1997, Compaq Computer acquired Tandem, and HP bought Compaq in 2002. After HP split into two companies, the Tandem technology lives on in the NonStop servers from HP Enterprise (HPE). See ServerNet and HP Enterprise.


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. See MPP. (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. See MPP. (Images courtesy of Tandem Computers Incorporated.)
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References in periodicals archive ?
Regarding the static balance assessment, Longridge and Mallinson (41) used the tandem Romberg test and did not find significant differences between young and elderly adults in relation to performance on the test, suggesting that this test is not effective at predicting balance conditions since it is not sufficiently precise in distinguishing individuals from different age groups.
In addition, the patient experienced difficulty performing the sharpened tandem Romberg test, particularly with the left foot forward.
Findings on the standard Romberg's test were normal, but the patient experienced a marked amount of difficulty performing the sharpened tandem Romberg's test with the left foot forward and somewhat less difficulty with the right foot forward.