实验15
在赋值的过程中有些错误，还好解决。assume cs:code
stack segment
db 128 dup (0)
stack ends
code segment
start:
mov ax,stack
mov ss,ax
mov sp,128
push cs
pop ds
mov ax,0
mov es,ax
mov si,offset int9
mov di,204h
mov cx,offset int9end-offset int9
cld
rep movsb
push es:
pop es:
push es:
pop es:
cli
mov word prt es:,204h
mov word ptr es:,0
sti
mov ax,4c00h
int 21h
int9:
push ax
push bx
push cx
push es
in al,60h
pushf
call dword ptr cs:
cmp al, 9eh
jne int9ret
;---------主要修改程序内容---------------
mov ax,0b800h
mov es,ax
mov bx,0
mov cx,2000
s:
mov byte ptr es:,41h
add bx,2
loops
;---------主要修改程序内容---------------
int9ret:
pop es
pop cx
pop bx
pop ax
iret
mov ax,4c00h
int 21h
int9end:nop
code ends
end start
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