INT 21 - DOS 2.25 only - GET LEAD BYTE TABLE ADDRESS                            
	AX = 6300h
Return: CF clear if successful
	    DS:SI -> lead byte table (see #01746)
	CF set on error
	    AX = error code (01h) (see #01680 at AH=59h/BX=0000h)
Notes:	does not preserve any registers other than SS:SP
	the US version of MS-DOS 3.30 treats this as an unused function,
	  setting AL=00h and returning immediately
SeeAlso: AX=6301h,AH=07h,AH=08h,AH=0Bh


Format of double-byte character set lead byte table entry:
Offset	Size	Description	(Table 01746)
 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
                                                                                

INT 21 - DOS 3.2+ - GET DOUBLE BYTE CHARACTER SET LEAD-BYTE TABLE               
	AX = 6300h
Return: AL = error code
	    00h successful
		DS:SI -> DBCS table (see #01746)
		all other registers except CS:IP(Internet Protocol) The lower level (transport layer) of the TCP/IP protocol suite.	See also TCP, TCP/IP. and SS:SP destroyed
	    FFh not supported
Notes:	probably identical to AH=63h/AL=00h for DOS 2.25
	the US version of MS-DOS 3.30 treats this as an unused function,
	  setting AL=00h and returning immediately, WITHOUT setting DS:SI;
	  only the Far East versions of MS-DOS 3.2 and 3.3 supported this call
	the US version of DOS 4.0+ accepts this function, but returns an empty
	  list
	IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. DOS 6.1 SYS.COM assumes that CF is set on error
SeeAlso: AX=6300h"DOS 2.25"