Abstract: A set of three input, three output bubble logic gates forms all of the possible distinct output functions for conservative three variable gates. The magnetic interaction between single wall domains propagating through separate channels defined by closely spaced circuit element paths causes the domains to switch to or remain on alternate paths via between-path transfer means in a predetermined fashion. In addition to vertically graded element transfer means, several new circuit arrangements are introduced including non-graded elements, strong and weak S-curves, elements having uneven gradation, and other circuit techniques. A group of primitive realizations are described which can be combined to produce other gates having output functions in each of 31 equivalence classes. A methodology for using the gates in logic design is suggested, and several new building block gates producing functions of two variables are presented.

Abstract: Magnetic bubble logic circuits performing the functions of various forms of flip-flops and decoders are presented. Set-reset and trigger flip-flops are constructed from specialized 3--3 conservative bubble logic circuits. Two forms of tree-type decoders employing crossovers of bubble tracks are illustrated for generating all possible product permutations of a plurality of input variables. Planar decoders and cross point circuits without crossovers are combined in matrix form to provide a multi-variable decoder without internal crossovers.