Help!!!

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Dear friends,

What is the difference between P89C51UBP-n & AT89C51?

My Amp has the P89C51UBP-N to control the functions DVD/CD/TAPE...Now
it can not be functioned anymore (It does not change the lights when I press the buttons).
If I were to have a new P89C51UBP-N, does it need to program before using?

Thank you!
PD
 
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