说明：  实现BCD码的乘法，要求被乘数和乘数以压缩BCD形式分别存放在内存单元DS:1000H和DS:1001H。乘积存放在另外两个内存单元DS:1002H和DS:1003H（低位在前，高位在后）
(To achieve multiplication of BCD code, required to compress BCD multiplicand and multiplier are stored in the memory unit form DS: 1000H and DS: 1001H. Product stored in the other two memory modules DS: 1002H and DS: 1003H (low front, high in the post))