serial or raster value producer the slm is one example of a parallel value consumer and while the invention has been described with reference to buffering values which are pixel values the reader will appreciate that the invention may be utilized in other applications involving other types of data as well in such applications the pixel write signal may simply be termed a u201c write signal u201d which term may also generically apply to its embodiment as a pixel write signal similarly the pixel copy signal may be simply termed a u201c copy signal u201d there are many suitable ways of describing the various values the value from the pixel source may be termed a u201c new value u201d or a u201c next value u201d or the like and the value being provided to the pixel drive circuitry may be termed a u201c current value u201d or an u201c old value u201d or a u201c previous value u201d or the like the reader should appreciate that drawings showing methods and the written descriptions thereof should also be understood to illustrate machine accessible media having recorded encoded or otherwise embodied therein instructions functions routines control codes firmware software or the like which when accessed read executed loaded into or otherwise utilized by a machine will cause the machine to perform the illustrated methods such media may include by way of illustration only and not limitation magnetic optical magneto optical or other storage mechanisms fixed or removable discs drives tapes semiconductor memories organic memories cd rom cd r cd rw dvd rom dvd r dvd rw zip floppy cassette reel to reel.