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United States Patent | 3,783,250 |
Fletcher , et al. | January 1, 1974 |
A computer system using adaptive voting to tolerate failures and operate in a fail-operational, fail safe manner. Each of four computers is individually connected to one of four external input/output (I/O) busses which interface with external subsystems. Each computer is connected to receive input data and commands from the other three computers and to furnish output data and commands to the other three computers. An adaptive control apparatus including a voter-comparator-switch (VCS) is provided for each computer to receive signals from each of the computers and permits adaptive voting among the computers to permit the fail-operational, fail-safe operation.
Inventors: | Fletcher; James C. Administrator of the National Aeronautics and Space (N/A), N/A (Orange, CA), Koczela; Louis J. (Orange, CA), Wilgus; Donald S. |
Appl. No.: | 05/229,354 |
Filed: | February 25, 1972 |
Current U.S. Class: | 714/11 ; 714/10; 714/E11.069 |
Current International Class: | G06F 11/18 (20060101); G06f 015/16 () |
Field of Search: | 235/153AE,153AK 340/172.5 |
3312954 | April 1967 | Bible et al. |
3348197 | October 1967 | Akers, Jr. et al. |
3593307 | July 1971 | Gouge, Jr. et al. |
3614401 | October 1971 | Lode |
3624372 | November 1971 | Philip |
3654603 | April 1972 | Gunning et al. |
3665173 | May 1972 | Bouricius et al. |
3681578 | August 1972 | Stevens |