Int 21 Fn 18 - DOS 1+ - Null Function For Cp/m Compatibility [D]
AH = 18h
Return: AL = 00h
Note: corresponds to the CP/M BDOS function "get bit map of logged drives",
which is meaningless under MS-DOS
See Also: AH=1Dh,AH=1Eh,AH=20h,AX=4459h
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