It uses 'Pinyin' method, maybe some others as well, such as a telegraph-like 4-digit encoding.
The CEC-I was quite popular in the mid-to-late-1980's in many elementry schools in China.
This ][ clone uses 2x 64K*4 bits DRAM chips as its main memory, one 32K*8 EPROM (27256) for build-in BASIC and LOGO intepreter, 2x 128K*8 mask ROMs for Chinese fonts, and another 32K*8(27256) for Chinese processing programs,
It has integrated 5.25inch floppy disk controller, Joystick interface, and PAL color TV encoder hardware.
The CEC-I has pretty good compatibility with the Official Apple-II(Apple DOS 3.3, many games, etc). You can even add a Z-80 card to run CP/M 80.