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When using P89C669 to programme, what diffierence is there between using 64k Rom and using 96k?

I use the same programme and different Rom size, 64K and 96K. Then I fire them to Philips P89C669 separate. Then I use them and some functions don't work well using 96K one. Eg. some data is not correct.
I want to know what difference between using 64K translate and using 96K.
Thank you~