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OR gate

A ``t'' can be used as an OR gate for a pair of signals; the main concern is that one signal should not encroach upon the territory of the other when the second is absent. The signals arrive along the arms of the ``t,'' the composite departs along the stem. It is essential that the stem rise one cell above the crossbar, thereby isolating the incoming signals; a barrier lurks beneath it all.

 
Figure: OR gate



Harold V. McIntosh
E-mail:mcintosh@servidor.unam.mx