INT 6F - 10-NET v3.3 - MOUNT
        AH = 17h
        AL = local drive number (0=A:)
        BL = remote drive letter or '1'..'3' for LPTn or '4' or '5' for COMx
        DS:DX -> node ID, 12 bytes blank-padded
Return: CF set on error
            AX = error code (see AH=00h)
        CF clear if successful