Using the digital and miniaturization technology developed for calculators, Casio continued to develop new types of products. In October 1981, the company developed a large-capacity memory device, and released the TR-2000 electronic English-Japanese dictionary, which contained 2,020 English words and phrases in a notebook-sized unit, just 8 millimeters thick and weighing 53 grams. After that, Casio increased the memory capacity through semiconductor technology development, and produced new electronic dictionaries that also allowed the user to choose between a Japanese-language, kanji-character dictionary and other dictionaries with the touch of a button.