Circuit for simplex I/O terminal control by duplex processors

Details Circuit for simplex I/O terminal control by duplex processors Circuit for simplex I/O terminal control by duplex processors

1985-12-16

1988-04-05

Chan, Eddie P.

Boots, shoes, and leggings

371 9, 371 11, G06F 1120

Patent

active

047363398

ABSTRACT:
This circuit provides for the connection of simplex I/O terminals to duplex processor copies. Each processor copy's configuration provides for a 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.

REFERENCES:
patent: 4009469 (1977-02-01), Boudreau et al.
patent: 4012717 (1977-03-01), Censier et al.
patent: 4228496 (1980-10-01), Katzman et al.
patent: 4387426 (1983-06-01), Roberts
patent: 4532594 (1985-07-01), Hosaka et al.

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