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Int 21 Fn 440F - DOS 3.2+ - Ioctl - Set Logical Drive Map [D]
AX = 440Fh
BL = physical drive number (00h=default,01h=A:,etc))
Return: CF set on error
AX = error code (01h,0Fh) (see AH=59h)
CF clear if successful
drive now responds to next logical drive number
Notes: maps logical drives to physical drives, similar to DOS's treatment of
a single physical floppy drive as both A: and B:
DR-DOS 3.41-5.0 DRIVER.SYS does not support drive mapping and thus
always returns an error on this function
See Also: AX=440Eh,INT 2F/AX=122Bh
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