A Chinese language card or Chinese character card is a computer expansion card that improves the ability of computers to process Chinese text. Early computers were limited in processing speed and storage capacity. If a software like CC-DOS or zh:UCDOS is being used to render Chinese characters, the Chinese font could take up to 1/3 of RAM, making it impossible to execute large programs. Moreover, Chinese rendering via software must go through the BIOS, so that the speed is as slow as dozens of characters per second.