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====== Int 21H, AH=63H, AL=00H ======

===== Version =====

2.25, 3.2 and higher

===== Brief =====

GET LEAD BYTE TABLE ADDRESS

===== Family API =====


===== Input =====

        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)

  note: NO CF flag used in some versions
  AL = error code
    00h successful all other registers except CS:IP and SS:SP destroyed
    FFh not supported
   
===== Macro =====


===== Notes =====

  Does not preserve any registers other than SS:SP.
  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. IBM DOS 6.1 SYS.COM assumes that CF is set on error

  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

===== See also =====

  AX=6301h - AH=07h - AH=08h - AH=0Bh

===== Note =====

Text based on [[http://www.cs.cmu.edu/~ralf/files.html|Ralf Brown Interrupt List Release 61]]

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