编程：用7ch中断例程完成jmp near ptr s指令的功能，用bx向中断例程传送转移位移。

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

mov al,[si]

mov es:[di],al

inc si

add di,2

mov bx,offset s-offset ok

int 7ch

ok:     mov ax,4c00h

int 21h

nr:     push bp         ;定义中断例程[开始]

mov bp,sp

add [bp+2],bx

nrret:  pop bp

iret            ;中断返回指令

nrend:  nop             ;定义中断例程[结束]

code ends

end start