A photoconductor that includes, for example, a substrate, an optional ground plane layer, an undercoat layer thereover wherein the undercoat layer contains an aminosilane and a urea resin mixture; a photogenerating layer; and at least one charge transport layer. The screen dielectric stack includes a first sacrificial dielectric layer disposed outwardly from the semiconductor substrate and a second sacrificial dielectric layer disposed outwardly from and in contact with the first sacrificial dielectric layer. A first control valve adjusts the opening size of the first supply passage in response to the pressure in the suction chamber. Additionally, a memory circuit has an input coupled to the output node, and an output. The invention also includes methods of using the new systems, e.