There's also MSX-DOS 1. While the overall user interface was more like
MS-DOS, at least version 1.x was more or less binary compatible with
CP/M, provided that the CP/M files were copied to a FAT-format floppy.
MSX-DOS 2, however, added many more features of MS-DOS 2.x and 3.x and
was somewhat less CP/M compatible.
Mike