1
Jack J Stiffler, Michael J Budwey, James M Nolan: Memory back-up system. Sequoia Systems, Wolf Greenfield & Sacks, March 31, 1987: US04654819 (304 worldwide citation)

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 processing element. At a context switch, the stored ...


2
Jack J Stiffler, Michael J Budwey, James M Nolan Jr: Memory back up system with one cache memory and two physically separated main memories. Sequoia Systems, Wolf Greenfield & Sacks, April 4, 1989: US04819154 (138 worldwide citation)

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 processing element. At a context switch, the stored ...


3
Jack J Stiffler, Richard A Karp, James M Nolan Jr, Michael J Budwey, David A Wallace: Modular computer system. Sequoia Systems, Wolf Greenfield & Sacks, November 20, 1984: US04484273 (123 worldwide citation)

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 on the system. The processing units, memory un ...


4
Jack J Stiffler, Richard A Karp, James M Nolan Jr, Michael J Budwey, David A Wallace: Modular computer system. Sequoia Systems, Wolf Greenfield & Sacks, August 26, 1986: US04608631 (74 worldwide citation)

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 on the system. The processing units, memory un ...


5
Jack J Stiffler, Michael J Budwey, James M Nolan Jr: Self-checking computer circuitry. Sequoia Systems, Wolf Greenfield & Sacks, September 10, 1985: US04541094 (56 worldwide citation)

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 functionally-complete circuit. Each of the two circuit h ...


6
Jack J Stiffler, James M Nolan, Peter Mark, David Harvey: Shared computer resource allocation system having apparatus for informing a requesting computer of the identity and busy/idle status of shared resources by command code. Sequoia Systems, Wolf Greenfield & Sacks, May 19, 1992: US05115499 (48 worldwide citation)

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 which contains information representing the curr ...


7
Sanjoy Chatterji: Method and apparatus for dynamic installation of a driver on a computer system. Sequoia Systems, Wolf Greenfield & Sacks P C, September 2, 1997: US05664195 (46 worldwide citation)

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 accept a driver, and a data channel supporting co ...


8
Jack J Stiffler: Self-checking error correcting encoder/decoder. Sequoia Systems, Wolf Greenfield & Sacks, April 5, 1988: US04736376 (27 worldwide citation)

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 encoded outputs and all failures quickly reveal ...


9
Stiffler Jack J, Nolan James M, Budwey Michael J: Memory backup system.. Sequoia Systems, December 27, 1984: EP0128945-A1 (26 worldwide citation)

Apparatus for maintaining duplicate copies of information stored in fault-tolerant computer main memories. A non write-through cache memory associated with each of the system's processing elements stores computations generated by that processing element. At a context switch, the stored information i ...


10
Gerard E Bachand, Peter A Goodwin: Apparatus and method for detection of latent faults in redundant systems. Sequoia Systems, Wolf Greenfield & Sacks, June 28, 1994: US05325062 (19 worldwide citation)

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 monitored. During normal operation, while cu ...