Micron has been around since the 1970s, joining the stock market way back in 1984. How many shares would you have today, three stock splits later?Computer memory has been a lucrative business for decades, and Micron Technology (MU -1.12%) was always an important supplier of those crucial chips. The company was formed in 1978, made its first memory chip in 1981, and entered the public stock market in 1984.Micron soared over the next 20 years. It developed many industry standards and supplied chips to game-ch ...