汇编程序：植入程序的程序

任务：将beg_copy到end_copy的代码复制到0:200H处

assume cs:codeseg
codeseg segment
start:
     ...
beg_copy:
    mov ax, 0
    add ax, ax
    wait
end_copy: nop

codeseg ends
end start

参考解答：

assume cs:codeseg
codeseg segment
start:
    mov ax, cs
    mov ds, ax
    mov si, offset beg_copy

    mov ax, 0
    mov es, ax
    mov di, 200H

    mov bx, offset end_copy

copy: cmp si, bx
      jnb stop_copy
      mov al, [si]
      mov es:[di], al
      inc si
      inc di
      jmp copy
stop_copy:
    mov ax, 4c00h
    int 21h

beg_copy:
    mov ax, 0
    add ax, ax
    wait
end_copy: nop

codeseg ends
end start