i took it that you and andy know the answer to
my question, but both of you want me to do 'homework'.
fine, i've tried to show that i am not a 'give me
code' guy. if that's not good enough please tell me the criteria. i spent my effort, and i feel it's time to ask for a help

I have absolutotally no idea about how to use PDATA (do not use it, double dptr chips are so much more effective and the PDATA concept stumbles when you have ERAM which does not use P2 as upper address).

I merely stated that unless you have spent the time reading "the bible" you have no background for specifying a question. Of course, in this case, it is the Keil manual that is the base for understanding.

No, you do not ask "give me code" you ask "read the manual for me" which, I guess is Andys reason for his answer. I merely replied to your question "what is the requirement" since I have no idea about how to use PDATA.

Erik