An apparatus and method for automatically adjusting a gradient of a reset ramp waveform of a plasma display panel in order to automatically adjust a ramp waveform generated in a reset period contributing to deviation adjustments between circuit components and between panels are provided. The valve includes a housing having a bypass opening, an inlet opening, an outlet opening and an internal chamber between the inlet opening and the outlet opening. This acetolactate synthase contains a mutant small subunit encoded by the mutant ilvN gene. Layout data of a semiconductor apparatus are divided into sizes of the basic figures which take reduction in exposure into consideration so as to be classified according to the basic figures. It is an aspect of the invention to allow a user to selectively and readily convert the apparatus between mechanical firing actuation and electronic firing actuation.