In 1979, he invented a character generator program, which takes Tsang-chieh encoded data and dynamically generates Chinese characters for screen display. In the same year, Chu's team collaborated with the Acer company, and the program became incorporated in the firmware of a "Chinese computer". Later the generator was also used in the "Tsang-chieh controller board", which would enable an Apple II computer to display Chinese characters in its hi-res graphics mode. A particular interesting "feature" of this early system was that it would also take and generate characters not explicitly included in the codepage, but implied by the rules of Tsang-chieh.