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| assume cs:code,ss:stack,ds:data
stack segment
dw 0,0,0,0,0,0,0,0
stack ends
data segment
db '1. display '
db '2. brows '
db '3. replace '
db '4. modify '
data ends
code segment
start: mov ax,stack
mov ss,ax
mov sp,16
mov ax,data
mov ds,ax
mov bx,0
mov cx,4
s0: push cx
mov si,0
mov cx,4
s: mov al,[bx+3+si]
and al,11011111b
mov [bx+3+si],al
inc si
loop s
add bx,16
pop cx
loop s0
mov ax,4c00h
int 21h
code ends
end start
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