assume cs:codesg,ds:datssg,ss:stacksgdatasg segment   db ‘ibm             ‘   db ‘dec             ‘   db ‘dos             ‘   db ‘vax             ‘data endsstack segment   dw 0,0,0,0,0,0,0,0stack endscodesg segment   start:mov ax,stacksg           mov ss,ax           mov sp,16           mov ax,datasg           mov ds,ax           mov bx,0           mov cx,4   
 
   s0:     push cx           mov si,0           mov cx,3   s:      mov al,[bx+si]           and al,11011111b           mov [bx+si],al           inc si           loop s           add bx,16           pop cx           loop s0           mov ax,4c00H           int 21Hcodesg endsend start