XLAT/XLATB - Translate

        Usage:  XLAT    translation-table
                XLATB   (masm 5.x)
        Modifies flags: None

        Replaces the byte in AL with byte from a user table addressed by
        BX.  The original value of AL is the index into the translate table.
        The best way to discripe this is MOV AL,[BX+AL]

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        table offset      11    5     5     4             1

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