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.model tiny
.code
.startup
jmp Init
Old_09h dw 0,0
New09h:
mov ah, 02h
mov dl, 'A'
int 21h
jmp dword ptr cs:Old_09h
Init:
mov ah, 09h
mov dx, offset Msg
int 21h
mov ax, 3509h
int 21h
mov Old_09h, bx
mov Old_09h+2, es
mov ax, 2509h
lea dx, New09h
int 21h
end
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