Abstract: Brightness of input data ranging from 0 to 20% (brightness close to black) is converted to gradation Y0 (black) and brightness ranging from 80 to 100% (brightness close to white) is converted to gradation Y7 (white). Ranges of brightness from 20 to 35%, 35 to 45%, 45 to 50%, 50 to 55%, 55 to 65%, and 65 to 80% are converted to gradations Y1 to Y6, respectively. While brightness of the input data is converted to eight gradations which an LCD can display, intervals of brightness assigned to each of gradations are so specified that they are narrower around medium brightness (around 50%) than around the minimum (0%) or maximum (100%) brightness, i.e., the conversion is performed in a nonlinear manner.

Abstract: An information processing system and apparatus and an information recording medium wherein the compatibility of a program between preceding and succeeding models is assured without requiring a high cost are disclosed. In such a case wherein different models such as first, second and third apparatus are developed successively in time, emulation programs for the different models are stored in advance in program ROMs of the respective models. A difference in processing between the different models is accommodated by one of the emulation programs to establish compatibility between the operations of them. Before an application program is executed on any one of the apparatus, the emulation program is first started up.