编写int9的问题
assume cs:code,ds:datadata segment
dw 0,0
data ends
code segment
start:
mov ax,data
mov ds,ax
mov ax,0
mov es,ax
push es:
pop ds:
push es:
pop ds:
mov word ptr es:,offset int9
mov es:,cs
call show_a_z
push ds:
pop es:
push ds:
pop es:
mov ax,4c00h
int 21h
show_a_z:
push ax
push es
mov ax,0b800h
mov es,ax
mov al,'a'
show_a_z_s:
mov es:,al
cmp al,'z'
je show_a_z_e
call delay
inc al
jmp show_a_z_s
show_a_z_e:
pop es
pop ax
ret
delay:
push dx
push ax
mov ax,0
mov dx,1000h
delay_s:
sub ax,1 ;这里一开始我用的是dec运行变死循环为什么
sbb dx,0
cmp ax,0
jne delay_s
cmp dx,0
jne delay_s
pop ax
pop dx
ret
int9:
push ax
push bx
push es
in al,60h
cmp al,1 ;-----------------------------
jne int9_s
;这里我吧改变颜色的提到int9前面为什么就不变色了呢
mov ax,0b800h
mov es,ax
inc byte ptr es: ;--------------------------------
int9_s:
pushf
pushf
pop bx
and bh,11111100b
push bx
popf
call dword ptr ds:
int9_end:
pop es
pop bx
pop ax
iret
code ends
end start
最后是关于栈的
看书上用 pushpop的时候
有时候就定义栈有时候没有定义栈
不定义栈有什么坏处么
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