DOS / Functions / 63/00

                 INT 21 - DOS 2.25 only - GET LEAD BYTE TABLE

Input	DOS1	N	DOS2.25	Y	DOS3	N	DOS5	N	Output
AX	63h		00h						AX
BX									BX
CX									CX
DX									DX
ES:DI					Pointer to Lead Byte Table				DS:SI

Note:   Does not preserve any registers other than SS:SP