Int 21/AH=18h

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 - Category: DOS Kernel - Int 21h - D