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INT 21 - DOS 1+ - NULL FUNCTION FOR CP/M COMPATIBILITY
        AH = 18h
Return: AL = 00h
Note:   corresponds to the CP/M BDOS function "get bit map of logged drives",
          which is meaningless under MSDOS
SeeAlso: AH=1Eh,AH=20h,AX=4459h
See Also: 211D
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