In a compiler I have used earlier it was possible to see directly which databytes were where in the chain so that I did not have to try moving a byte to xdata just to find out that that space was shared by someting else making the move worthless. Is such a table available with Keil? I can make neither head nor tail of the M51 file in this respect. Erik
pls give me the gist of how to figger it out thanx, Erik