A microcomputer and method for same can contain a nonvolatile memory module and store information regarding various system models in the memory module to support the various system models by one keyboard BIOS. Functions preset in the microcomputer, which includes a keyboard controller are not removed even though system voltages are removed so the preset functions are maintained. Preferably, the microcomputer includes a nonvolatile memory module for storing desired, prestored information even when system voltages are removed, and a keyboard controller module for performing control operations of a keyboard with a keyboard basic input/output system (BIOS). The desired information can include function information set by a user, current status information, and design selection information for designing the keyboard BIOS appropriately to an applied system.