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Int 21 Fn 39 - DOS 2+ - "mkdir" - Create Subdirectory [D]
AH = 39h
DS:DX -> ASCIZ pathname
Return: CF clear if successful
AX destroyed
CF set on error
AX = error code (03h,05h) (see AH=59h)
Notes: all directories in the given path except the last must exist
fails if the parent directory is the root and is full
DOS 2.x-3.3 allow the creation of a directory sufficiently deep that
it is not possible to make that directory the current directory
because the path would exceed 64 characters
under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
See Also: AH=3Ah,AH=3Bh,AH=6Dh,AH=E2h/SF=0Ah,INT 2F/AX=1103h
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