assume cs:code,ds:data
data segment
arr db 'AbCdE$'
;db 'FgHiJ$'
data ends
code segment
start:
mov ax,data
mov ds,ax
mov bx,0
mov cx,5
s: mov al,ds:[bx]
or al,00100000B
mov ds:[bx],al
inc bx
loop s
lea dx,arr
mov ah,9h
int 21h
mov ax,4c00h
int 21h
code ends
end start
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