RDS 5000 EON code?

My car has been stood for 8 months thus causing a flat battery, ive charged it up and noticed its reset my radio. I bought the car from my dad and he cant remember the code.
Its specs are: Part No: 96AP 18K876 AC, Serial No: M140696, Model: 5000 RDS E-O-N.
If anyone could help me with this, it would be much appreciated, Thanks.