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external memory problem

ratnakarreddy manda

hi,

i developed code for my project in AT89s52.
complete code is working properly.
now i need EEPROM,so i modified my code to AT89S8252.
my external data getting modified.
RAM test is ok.
hard ware is ok.
iam receiving data from PC through serial communication.
storing same data into external memory.
sending same data to PC.
some of the data getting modified.
plz help in this issue.

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