Abstract: Techniques for restoring parameters and/or values include determining a set of one or more parameters and/or values to be accessed by a user and that are stored in a first memory location, retrieving a duplicate of the set of one or more parameters and/or values to be accessed and storing that duplicate set in another memory location. In the event that one or more of the set of one or more parameters and/or values accessed by a user need to be placed back to their previous state, the duplicate set of one or more parameters and/or values is retrieved to replace one or more of the set of parameters and/or values accessed by the user.

Abstract: Techniques for restoring parameters and/or values include determining a set of one or more parameters and/or values to be accessed by a user and that are stored in a first memory location, retrieving a duplicate of the set of one or more parameters and/or values to be accessed and storing that duplicate set in another memory location. In the event that one or more of the set of one or more parameters and/or values accessed by a user need to be placed back to their previous state, the duplicate set of one or more parameters and/or values is retrieved to replace one or more of the set of parameters and/or values accessed by the user.

Abstract: A high voltage multiplexer, useful in power supplies for electrophotographic printers, that converts a high voltage DC input into an AC modulated DC signal that is selectively applied to one of a plurality of outputs. The selected output depends on signals applied to a set of control inputs. That multiplexer is useful in a power supply system having a high voltage DC source for producing the DC input and a clock input for setting the AC modulation frequency. That power supply is useful in an electrophotographic printer having a plurality of developers and a controller. The power supply system then selectively powers one of the developers as directed by signals from the controller.