COMPRESS:
LODSB ;X[n]-X[n-1]
SUB _______________ ;FLAG=NOT FLAG
________________________
J_______ LOW_HEX
MOV CL,4
________ AL,CL
MOV AH,AL
JMP NEXT
LOW_HEX:
_________________________
OR AL,AH
STOSB
NEXT: _________________________
JNE COMPRESS
;****END****
LEA DX,RESULT ;结果数据区首址
LEA SI,NAME1 ;结果文件名
MOV CX,N+1 ;字节数
CALL SAVE ;保存结果到文件
RET
START ENDP
CODE ENDS
END START
答案：5.(1)AL,[SI-2]
(2)XOR BX,0FFH
(3)Z
(4)SHL
(5)AND AL,0FH
(6)DEC DX