A diabetes management system is provided that employs a communication protocol with enhanced security. In such a case, it is general practice to densely arrange a large number of contact electrodes in a matrix over a Schottky junction region. The specific data needed for the SIMD instruction is identified. A shifting mechanism for shifting said transmission and the position of said second shaft so as to change the direction of rotation of said second shaft, by causing said third beveled gear to selectively mesh with a selected one of said first and second beveled gears. The tape drive mechanism includes a pair of rollers that form a nip therebetween. The first and second latches may alternately store video data of different horizontal lines.