  This paper discusses a logical operation of multi-memories that consist of
coupled nonlinear micro-electro-mechanical systems (MEMS) resonators. A MEMS
resonator shows two coexisting stable states when nonlinear responses appear.
Previous studies addressed that a micro- or nano-electrical-mechanical
resonator can be utilized as a mechanical 1-bit memory or mechanical logic
gates. The next phase is the development of logic system with coupled
multi-resonators. From the viewpoint of application of nonlinear dynamics in
coupled MEMS resonators, we show the first experimental success of the
controlling nonlinear behavior as a 2-bit binary counter.
