实验6

（2）
assume cs:codesg,ss:stacksg,ds:datasg

stacksg segment
     dw 0,0,0,0,0,0,0,0
stacksg ends

datasg segment
     db '1.display.......'
     db '2.brows.........'
     db '3.replace.......'
     db '4.modify........'
datasg ends

codesg segment

start:
     mov ax,stacksg
     mov ss,ax
     mov sp,10H
     mov ax,datasg
     mov ds,ax
     mov bx,0
     mov si,2
     mov cx,4
w:     push cx
     mov cx,4
n:     mov al,[bx+si]
     and al,11011111B
     mov [bx+si],al
     inc si
loop n
     add bx,16
     mov si,2
     pop cx
loop w
     mov ax,4c00h
     int 21h
codesg ends
end start