求大神帮助，关于转换组成BCD

就是不会才发帖询问，能不能帮写一个，学习一下

我写了另外一个关于 从键盘输入两个2位十进制正数，对这两个数进行加法或者乘法运算，结果以十六进制数形式显示在屏幕上。调试有问题 帮我看看
DATAS SEGMENT
   SHURU1 DB  5,0,0,0,0,0,0, 0AH,0DH,'$'
   SHURU2 DB  5,0,0,0,0,0,0, 0AH,0DH,'$'
   RES DW 0
   NUM DB 0AH
   SHUCHU  DB  3  DUP(0),0AH,0DH,'$'
DATAS ENDS

STACKS SEGMENT PARA STACK
   
STACKS ENDS

CODES SEGMENT
     ASSUME CS:CODES,DS:DATAS,SS:STACKS
START:
     MOV AX,DATAS
     MOV DS,AX
     LEA DX,SHURU1
     MOV AH,0AH
     INT 21H
     LEA DX,SHURU2
     MOV AH,0AH
     INT 21H
   
     LEA SI,SHURU+2
     MOV BX,0
     MOV AL,[SI]
     SUB AL,30H
     MUL NUM
     ADD RES,AX
     INC SI
     MOV AL,[SI]
     SUB AL,30H
     ADD RESULT,PTR WORD AL
     LEA SI,BUF2+2
     MOV BX,0
     MOV AL,[SI]
     SUB AL,30H
     MUL NUM
     ADD RES,AX
     INC SI
     MOV AL,[SI]
     SUB AL,30H
     ADD RESULT,PTR WORD AL
   
     MOV AX,RES
     AND AX,00F0H
     CMP AX,09H
     JBE OO
     ADD AX,37H
     LEA SI,SHUCHU
     MOV [SI],AX
     INC SI
     JMP LL
   
 OO: ADD AX,30H
     LEA SI,SHUCHU
     MOV [SI],AX
     INC SI
   
LL:MOV AX,RES
     AND AX,000FH
     CMP AX,09H
     JBE XX
     ADD AX,37H
     MOV [SI],AX
     JMP DONE
  XX:ADD AX,30H
     MOV [SI],AX
DONE:
     LEA DX,SHUCHU
     MOV AH,09H
     INT 21H   
     MOV AH,4CH
     INT 21H
CODES ENDS
     END START