跳转指令JNZ(jmp not equal)

TITLE A06MOVE (EXE) Repetitive move operations
.MODEL SMALL
.STACk 64
;---------------------------------------------------------------------- 
.DATA
HEADNG1 DB 'InterTech'
HEAdNG2 DB 9 DUP('*'),'$'

.CODE
A10MAIN PROC FAR

MOV AX,@data ;初始化数据段
MOV DS,AX ;
MOV ES,AX 

MOV CX,09 ;循环次数
LEA SI,HEADNG1 ;LEA指令:取得HEADNG1偏移地址并保存到SI
LEA DI,HEADNG2 ;同上
A20: 
MOV AL,[SI] ;取[SI]单元
MOV [DI],AL ;
INC SI ;SI加1
INC DI 
DEC CX ;CX减1
JNZ A20 ;JNZ(jmp not zero) 如果CX为0则跳转

MOV AX,4C00H
INT 21H 
A10MAIN ENDP
END A10MAIN