chang.asm

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DSEG          SEGMENT   
              BCD DB        86H
              MESS DB        'HELLO',0DH,0AH,'$'
               ASCII   DB 2 DUP(?)
DSEG          ENDS      
     
CSEG          SEGMENT
                            ASSUME    CS:CSEG ,DS:DSEG 
              
START:        MOV       AX,DSEG           ;  01110100
              MOV       DS,AX             ;  00001111
              MOV       AL,BCD  ;清高位为0  ----------
              AND       AH,0FH             ;  00000100
              ADD       AL,30H
              MOV       ASCII+1,AL
              
              MOV       AL,BCD 
              MOV       CL,4
              SHR       AL,CL
              ADD       AL,30H
              MOV       ASCII,AL
              
              MOV       AL,ASCII
              MOV       DX,OFFSET MESS 
              ADD       DX,AX          ;此处用的是字符与数字相乘当然不会得出正确答案
              MOV       AH,9
              INT       21H
              MOV       AH,4CH
              INT       21H
CSEG          ENDS                
              END       START