A polymer having, at one terminal moiety thereof, a terminal structure having two or more carbon-carbon unsaturated bonds. In such circuits, an ultrasonic transducer is typically used as both transmitter and receiver. The facing can be stylishly molded from a synthetic resinous material or other non-metallic substance to facilitate manufacture and is disposed to conceal unsightly weld lines and other imperfections on the exterior surface of the hopper. This feed forward resistive network is used to forward a low-frequency drift compensation signal from the input terminal to the input amplifier, using a passive resistive network, to compensate for low frequency variations in the input data signal, and to develop a desired bias voltage at the input amplifier. The electrolyte includes a gel polymer electrolyte on opposite surfaces of a ceramic solid electrolyte. The system also includes means for executing software interrupt instructions, using emulation software forming part of the host program in order to emulate the way in which these instructions would have been executed by the earlier microprocessor.