assume cs:code
stack segment
db 128 dup (0)
stack ends
code segment
start: mov ax,stack
mov ss,ax
mov sp,128
mov ax,0
mov es,ax
push es:[9*4]
pop es:[200h]
push es:[9*4+2]
pop es:[202h]
mov ax,cs
mov ds,ax
mov si,offset int9
mov ax,0
mov es,ax
mov di,204h
mov cx,offset int9end-offset int9
cld
rep movsb
cli
mov word ptr es:[9*4],204h
mov word ptr es:[9*4+2],0
sti
mov ax,4c00h
int 21h
int9: push ax
push cx
push bx
push es
in al,60h
pushf
call dword ptr es:[200h]
cmp al,9eh
jne int9ret
mov ax,0b800h
mov es,ax
mov ah,'a'
mov bx,0
mov cx,2000
s: mov es:[bx],ah
add bx,2
loop s
int9ret:pop es
pop bx
pop cx
pop ax
iret
int9end:nop
code ends
end start
我在command.com窗口下运行程序发生错误直接跳出到WINDOWS，在实DOS下则死机了。这是怎么回事？？？ |
