89C669FA how to use EDATA

Does any one know how to declare variables and structures to use all the available internal ram in P89C669FA, Philips calls them with various names such as XDATA, EDATA, HDATA etc, I am not able to force the compiler to recognize the EDATA from 7F:0100 to 7F:04FF a lot of searching on the net has not yielded any solution.


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