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How to use Externel Memory to store data Using AT89C51

I am using AT89c51. I have a project to get date from Rs232 and store on ROM. I dont know how to do this with Keil. If any one could help me.
thanks in advance.

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  • "By the way PROM , EPROM And EEPROM all are addition of ROM"

    Yes - and the important addition is the 'P' for "Programmable"

    If you just have ROM with no 'P' then you cannot program it!

    "Matter is that u understude what i was aking."

    No, I don't - your question is too vague to answer.
    Exactly what sort of external memory are you talking about:
    parallel UV-EPROM?
    parallel Flash EPROM?
    serial EEPROM?
    something else?

  • "I u dont know the solution why u r waisting others time."

    Don't use SMS abbreviations if you want to be taken seriously. We do not wish to waste our time decoding them.

    "Matter is that u understude what i was aking."

    Your question is hopelessly vague. Explain what problem you are actually having.