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Something about use external programming memory....

Hi,
I am using 8052 of Winbond W78LE52 microcontroller. My code is excess it's range. So I want to use external programming memory only. It means I don't want to use programming memory on-chip. I know that the pin EA of 8052 should be pull low. What should I do in coding? Should I programming my code in chip only or in ROM only or both? Can you show me some demo code and tell me how to do it step by step? By the way, should I choice "Memory Model : Large: variables in XDATA"?

Sincerely yours,
Ross Lee

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