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The Computer Journal 1976 19(3):250-253; doi:10.1093/comjnl/19.3.250
© 1976 by British Computer Society
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Timing problems in electronic lockout chains

R. P. Lorétan *

Grossackerstrasser 32, Zurich, Switzerland

Lockout circuits similar to the arrangements used in electro-mechanical telephone exchanges to allow access to common resources are needed in multiprocessor computer configurations. The propagation time of the control signal, negligible in low speed relay circuits, can now lead to ambiguous situations resulting in temporary double connections. The problem is analysed and an improved circuit presented.

Received January 1975.

* Present address: Grossackerstrasser 32, 8041 Zürich, Switzerland.

§ Department of Electrical Engineering Science, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, Essex


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