CJK characters
Chinese is written almost exclusively in Chinese characters. It requires over 3,000 characters for general literacy, but up to 40,000 characters for reasonably complete coverage. Japanese uses fewer characters — general literacy in Japanese can be expected with 1,945 characters. The use of Chinese characters in Korea is becoming increasingly rare, although idiosyncratic use of Chinese characters in proper names requires knowledge (and therefore availability) of many more characters. However, even today, students in South Korea are taught 1,800 characters.
Chinese typewriter
Lin had a prototype machine custom built by the Carl E. Krum Company, a small engineering-design consulting firm with an office in New York City. That multilingual typewriter was the size of a conventional office typewriter of the 1940s. It measured 36 × 46 × 23 cm (14" x 18" x 9"). The typefaces fit on a drum. A "magic eye" was mounted in the center of the keyboard which magnifies and allows the typist to review a selected character. Characters are selected by first pressing two keys to choose a desired character which is arranged according to a system Lin devised for his dictionary of the Chinese language. The selected Chinese character appeared in the magic eye for preview, the typist then pressed a "master" key, similar to today's computer function key. The typewriter could create 90,000 distinct characters using either one or two of six character-containing rollers, which in combination has 7000 full characters and 1,400 character radicals or partial characters.