UniBug

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The UniBug walker series is the successor to the VBug series. In place of the Schmitt Nervous Nets, Tilden uses the Bicore topology built on 74xx240 ICs. The walkers feature the Unicore or Unified Bicore architecture. These are combination Master-Slave Bicores with accompanying neurons. This architecture enables the UniBugs to be highly adaptive.

Mark Tilden explains the evolution from VBug to UniBug this way: the "brain is connected to a 'Nervous Net' body that can hold onto rhythms. Walkman is a creature that dances around rhythms very effectively. It does a pretty good job of surviving. But it's limited, it can't evolve much further. With the Unicore, you can actually remember, and move, and then close that loop, so you have a structure which is pretty close to being an artificial life-form. The first creature that used it was Strider."