Int 21 Fn 6F03  U - Dos 5+ Rom - Set Exclusion Region List                 [D]

   AX = 6F03h
   DS:DX -> new exclusion region list (see #1462)

Return: CF clear
   AL = 00h

Notes: DOS saves only the pointer and assumes that the contents of the list
     are never changed, and that regions do not overlap
   if AL > 03h on entry, DOS returns CF set/AL=01h

See Also: AX=6F01h,AX=6F02h