INT 33 - MS MOUSE v7.05+ - GET CURRENT MINIMUM/MAXIMUM VIRTUAL COORDINATES
        AX = 0031h
Return: AX = virtual X minimum
        BX = virtual Y minimum
        CX = virtual X maximum
        DX = virtual Y maximum
Note:   the minimum and maximum values are those set by AX=0007h and AX=0008h;
          the default is minimum = 0 and maximum = absolute maximum
          (see AX=0026h)
SeeAlso: AX=0008h,AX=0010h,AX=0026h