The microcomputer based electronic engine control is aiming to attain much more precise engine control than mechanical or analog-electronic systems. Even this system involves certain problems. The latest advancement of semiconductor technology is quite evident. We have developed a new 8-bit single chip microcomputer, the uPD7811G, based on our latest semiconductor technology. The outcome of our examination of engine control realized by using the uPD7811G, particularly its software, are described in this paper.