INT 62 - BW-TCP - ETHDRV.SYS - MAP EMS PAGE FRAME
        AH = FEh
        AL = direction
            00h map in driver's memory block
            01h map out driver's memory block
Return: CF clear if successful
        CF set on error
            AL = error code
Note:   this function is supported by at least the SLIP and ODI versions of
          ETHDEV.SYS
SeeAlso: INT 21/AH=3Fh"BW-TCP",INT 62"BW-TCP",INT 63"BW-TCP",INT 64/AH=FEh

.