Circuit for simplex i/o terminal control by duplex processors

G - Physics – 06 – F

Patent

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354/233

G06F 11/20 (2006.01)

Patent

CA 1269172

A CIRCUIT FOR SIMPLEX I/O TERMINAL CONTROL BY DUPLEX PROCESSORS ABSTRACT OF THE INVENTION This circuit provides for the connection of simplex I/O terminals to duplex processor copies. Each processor copy's configuration provides for n terminal control circuit. These copies of the terminal control circuit are cross connected in order to provide access from each processor to each I/O terminal. Normal operation consists of a particular I/O terminal being operated by one processor copy. If the processor copy corresponding to a particular terminal is faulty or removed from service, that terminal is then automatically cross-connected to the active processor copy and receives output from that processor copy. If one processor copy is out of service, both I/O terminals receive output from the active processor copy. If the I/O terminal which is normally connected to the active processor copy becomes out of service and the other processor copy is out of service, the I/O terminal which is normally connected to the other processor copy will be reconfigured to be connected to the active processor. The active processor will then accept input from the I/O terminal of the other copy as well as transmit output to that I/O terminal.

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