Digital circuitry, such as interconnective pads which are patterned as waffles according to the embossing methods for flexible substrates which are disclosed, so as to be especially suited for the interconnection of stacks of circuitry blocks forming digital memory known as Permanent Inexpensive, Rugged Memory cross point arrays. In one embodiment, the audio converter device receives the digital audio data from a first device via a local area network. The DCSSM can also be programmed to modify existing recognized standardized signaling templates. In another embodiment, the charge storage layer comprises a dopant that is graded. The predicted vector data is transferred from the first storage device to a second storage device before the succeeding packet is received such that the predicted vector data can be cached in the second storage device. ; which is substantially discolored at a temperature equal to or higher than T; and which does not recover its color once discolored, even when its temperature is lowered to a temperature lower than T again, and the heat-responsive-discolorable coloring composition containing a polymer having a glass transition temperature of 60 to 200 C.