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I have never used external RAM before (beleive it or not :-o ) . Now I am using an NVRAM from Dallas so that in case of power failure the value of some variables is retained. My question is how do I declare the 'Non Volatile External' variable and how do I retreive the previous (pre-power fail) value ?
It sounds like your entire XDATA is going to be non-volatile, so anything you define as xdata will be non-volatile! "how do I retreive the previous (pre-power fail) value?" You just read it and, because it's non-volatile, it will still have its previous value!