Solution:

Generally, you can clear CMOS data by pull out the battery or change the jumper setting for clear CMOS. To clear the CMOS unfortunately is not that same with PCA-6143P, the battery is embeded/integrated inside the DALLAS chip (DS 12887) The file (KK.EXE) is an execution file. If you execute, all the parameters in your CMOS will be cleared and it loads BIOS's default value. The second file is BIOS ROM file, in case the first file doesn't work with your system, you can use a ROM writer to write this file into a EPROM (eg. 27C512) and replace the ROM which is on the board.