The file exists in PC DOS 1.0 to 7.10 and DR-DOS 5.0 and higher (except for DR-DOS 7.06), with MS-DOS using MSDOS.SYS (from version 1.0 to 6.22) for the same purpose. DR DOS 3.31 to 3.41 used the equivalent DRBDOS.SYS file instead.
In Digital Research terminology, the kernel component of the operating system is called the BDOS (Basic Disk Operating System), a term originally coined by Gary Kildall's in 1975 for CP/M, but which is continued to be used in all other DRI operating systems. Microsoft has used this name as well when referring to the kernel of the MSX-DOS operating system.
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