A digital multilevel memory system includes a charge pump and a voltage regulator for generating regulated high voltages for various memory operations. The layer is exposed to an aqueous liquid etching solution comprising a hydroxide and a fluoride, and having a pH of at least 10, under conditions and for a period of time effective to etch the elemental silicon from the substrate. A current load for the cell or cell sector can also be obtained and used to control the number of simultaneous message transmissions to the cell sector to avoid overloading the sector. A pair of opposed inkjet printhead assemblies are mounted on the frame downstream of the inlet roller assembly to define a printing zone between the printhead assemblies. The present invention is directed to an emulsion comprising a hydrophobic resin particle dispersed in a water-based medium as a resin component, wherein 20 to 60% by weight in the entire resin components including the hydrophobic resin particles is a polymer emulsifier and the average particle diameter of the particles contained therein is 50 nm or smaller. The drain control assembly also includes a moveable member configured to move between a first position and a second position within the bore of the receiving member to cause a cable to open or close a drain valve assembly.