A computer system and method for allowing either a primary computer or a backup computer to access a hardware resource, depending on which computer is executing an application that needs the hardware resource. An installation is downloaded to a portable device. By periodically switching each first terminal between an inputsupply voltage line and an output voltage line while also periodically switching each second terminal between the output voltage line and a reference voltage line, an output voltage having little ripple may be efficiently produced. The device may also be comprised of diamond grown on a mandrel into a trumpet shape, which may then be brazed or epoxied into the component. The method includes providing a polymer having at least one vinyl aromatic block; and hydrogenating the polymer in presence of a heterogeneous catalyst on a support, wherein the heterogeneous catalyst consists essentially of Ru, Zn and B, or Ru, Zn and P.