China DOS Union

Regarding the operating environment and exit of the Peking University DOS (BDDOS) Chinese character system, after repeated tests by myself, version 2.0 cannot run to the Chinese character mode on any virtual machine or emulator; versions 5.0 and 6.0 can run normally under DOS 3.3X. The exit method is: press Ctrl + F3, the bottom prompt line displays "Warning: CCDOS will be released Y/N", then press Y to exit the system and return to the Western mode.

UCDOS 2.01 was a work of Hope Software before Bao Yueqiao joined it. At that time, Bao Yueqiao developed PTDOS 2.0. After Bao Yueqiao joined Hope Software, he developed UCDOS 3.0 based on PTDOS 2.0. UCDOS 3.0 and subsequent versions used the name UCDOS 3.0 was developed on the basis of PTDOS 2.0. In fact, it has no relation to UCDOS 2.01 and subsequent versions. It is completely unrelated to UCDOS 3.0 is developed on the basis of PTDOS 2.0. In fact, it is completely unrelated to UCDOS 2.01. Additionally, UCDOS 2.01 has a special feature that the prompt line is at the top of the screen, including input methods, etc., displayed at the top of the screen, which is unique compared to other Chinese character systems with the prompt line at the top of the screen, it is unique. Also, do not know how to exit to the western mode. Does anyone know how to exit UCDOS 2.01? If anyone knows, please post it.

I remember seeing the words "BDDOS" in a student's dictionary at school. That dictionary was from the 2002 edition.