将”mov ax,4c00h”前的指令复制到内存 0:200处

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assume cs:codesg
codesg segment
    mov ax,076Ch ;经观察程序从076Ch开始
    mov ds,ax
    mov ax,0020h
    mov es,ax
    mov bx,0
    mov cx,17h  ;4c00前指令有17H字节
s:
    mov al,[bx]
    mov es:[bx],al
    inc bx
    loop s
    mov ax,4c00h
    int 21h
codesg ends
end