958,884. Parametrically excited resonators; transistor logic circuits. SPERRY RAND CORPORATION. April 30, 1963 [May 9, 1962], No. 17001/63. Headings H3B and H3T. [Also in Division G4] A circuit arrangement for producing all sixteen possible Boolean functions of two independent binary variables employs three-input majority logic circuits. As shown in Fig. 1, binary variables A, B are applied directly or after inversion (indicated by small circles) to four majority logic circuits 10-16, together with control inputs X 1 -X 4 , the particular combination of binary values of which determines the particular output logical function f (A,B) which is produced at 40. A fixed " 0 " input is applied to majority logic circuits 18, 20 which receive the outputs of circuits 10-16, the outputs of the circuits 18, 20 being applied together with a fixed " 1 " input as inputs to a final majority logic circuit 22. A second embodiment (Fig. 2, not shown), also capable of producing all possible Boolean functions of two binary variables, comprises only three majority logic circuits, but the " control " inputs X 1 , X 2 may be connected to the variable inputs A, B. The majority logic circuits may each comprise a transistor, Fig. 4, or a parametron, Fig. 5. A plurality of circuits such as that shown in Fig. 1 may be combined in a " tree " arrangement to produce Boolean functions of more than two variables (Fig. 7, not shown).
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