Content-addressable memories based on magnetic-domain logic

The paper proposes the implementation of logic into magnetic-bubble memories, and particularly the realisation of a content-addressable data storage. The basic bubble-interactive logic and flip-flop functions are briefly reviewed. This is followed by the discussion of the most suitable memory structure and of the logical requirements for content addressing. Two cellular bubble logic-in-memory arrays and their operation modes are described in some detail. One employs successive, the other simultaneous, data access. A comparison between these two designs and a similarly structured random-access bubble memory device is given with special consideration for bit packaging density, interface terminals and data-access time.