The year 1965 saw the beginning of competition by manufacturers for shares of the calculator market, which was known as the "calculator wars." The calculator continued to evolve from use of transistors to integrated circuits (IC) in just 3 years, and in another 3 years to use of large scale integration (LSI) integrated circuits. In 1972, Casio launched the Casio Mini, which operated with a single-chip LSI calculator chip. The Casio Mini was the size of a small lunch box, much smaller than the cash-register size 001. The Casio Mini, priced at only 12,800 yen, also marked a large reduction in price compared to the 001 priced at 380,000 yen. The age of calculators for personal use had begun.