sir,
actually the external memory is of 64kb
the distance between two 89c51 Uc's
are about maximum of half meter.
the data must be transferred within fraction of a second.
Actually in the first microncontroller data is stored through serial port.
And thereby whenever i want the data then i will retrieve from that controller to my controller where i am having lcd and keyboard connections.
that's why i refused to put again serial communication. Suggest me how to take ports as i was newer to this i am in a little bit of confusion. I want to integrate lcd,keyboard,printer to one microcontroller and the other one is consisting of external memory with rs232
regards
narasimha rao