assume cs:code
data segment
db 'conversation',0
data ends
code segment
start: mov ax,cs
mov ds,ax
mov si,offset nr
mov ax,0
mov es,ax
mov di,200h
mov cx,offset nrend-offset nr
cld
rep movsb ;以上9句为安装中断例程
mov word ptr es:[7ch*4],200h
mov word ptr es:[7ch*4+2],0 ;以上2句为设置中断向量
mov ax,data
mov ds,ax
mov si,0
mov ax,0b800h
mov es,ax
mov di,12*160
s: cmp byte ptr [si],0
je ok ;如果是0跳出循环
mov al,[si]
mov es:[di],al
inc si
add di,2
mov bx,offset s-offset ok ;设置从标号ok到s的转移位移
int 7ch ;转移到标号s处
ok: mov ax,4c00h
int 21h
nr: push bp ;定义中断例程[开始]
mov bp,sp
add [bp+2],bx
pop bp
iret ;中断返回指令
nrend: nop ;定义中断例程[结束]
code ends
end start |
