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INT 21 - Asian DOS 3.2+ only - GET DOUBLE BYTE CHARACTER SET LEAD TABLE
        AX = 6300h
Return: AL = error code
            00h successful
                DS:SI -> DBCS table (see below)
                BX, CX, DX, BP, DI, and ES destroyed
            FFh not supported
Notes:  probably identical to AX=6300h for DOS 2.25
        The US version of DOS 4.0 accepts this function, but returns an empty
          list

Format of DBCS table:
Offset  Size    Description
 00h  2 BYTEs   low/high ends of a range of leading byte of double-byte chars
 02h  2 BYTEs   low/high ends of a range of leading byte of double-byte chars
        ...
  N   2 BYTEs   00h,00h end flag