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Assignee: Sequoia Systems, Inc.


Location: Marlborough, MA
No. of patents: 10

NumberTitleIssue Date
5664195Method and apparatus for dynamic installation of a driver on a computer system
A method is provided for dynamic installation of a driver on a computer system. The computer system has a first operator processor with a first memory and an operating system, a second processor with a second memory and operating code configurable to acce...
09/02/1997
5621887Fault tolerant disk management system which tests failed disks during varied time intervals which are based upon the criticality associated with the failed disks
A fault tolerant disk management system supports compound disks which are mirrored, so as to tolerate single point faults in any one physical disk of the compound disk. The system further minimizes the exposure of data stored on such a compound disk arisi...
04/15/1997
5325062Apparatus and method for detection of latent faults in redundant systems
Apparatus and method are provided for fault detecting in an electrical system such as a redundant or fault-tolerant system. A current receiving device connected in shunt or in series in such a system draws electric current from the electrical system being...
06/28/1994
5115499Shared computer resource allocation system having apparatus for informing a requesting computer of the identity and busy/idle status of shared resources by command code
Computer system resources shared by several central processing units are allocated by allowing one processing unit to temporarily gain exclusive access to a particular shared resource. Access to a particular resource is controlled by a memory location whi...
05/19/1992
4819154Memory back up system with one cache memory and two physically separated main memories
Apparatus for maintaining duplicate copies of information stored in fault-tolerant computer main memories is disclosed. A non write-through cache memory associated with each of the system's processing elements stores computations generated by that process...
04/04/1989
4736376Self-checking error correcting encoder/decoder
Encoding/decoding circuitry which processes data and both corrects single errors and detects multiple errors is disclosed. The circuitry is both fail-safe and self-checking in that no internal device failure can alter data without producing improperly enc...
04/05/1988
4654819Memory back-up system
Apparatus for maintaining duplicate copies of information stored in fault-tolerant computer main memories is disclosed. A non write-through cache memory associated with each of the system's processing elements stores computations generated by that process...
03/31/1987
4608631Modular computer system
A multi-processor computer system is disclosed in which processing elements, memory elements and peripheral units can be physically added and removed from the system without disrupting its operation or necessitating any reprogramming of software running o...
08/26/1986
4541094Self-checking computer circuitry
Circuitry for a fault-tolerant computer is disclosed which circuitry is constructed in two identical halves. Each half, by itself, is not a functionally-complete circuit, however, the two identical halves can be connected together to provide a functionall...
09/10/1985
4484273Modular computer system
A multi-processor computer system is disclosed in which processing elements, memory elements and peripheral units can be physically added and removed from the system without disrupting its operation or necessitating any reprogramming of software running o...
11/20/1984
 
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