> Please ponder what I'm saying here and let us know how > things work out for you ok Joe? Will do. For the moment I have a working logger that can take and store measurements for a week and that's the priority, even if I haven't appreciated every nuance of table addressing. It is important that I do understand because part of another current project requires that data from a PC be downloaded to the PIC and stored. It will need full erase, write and read routines. You're correct - I did take selected parts of the example in the manual (mostly omiting the erase because flash will be cleared to FF before programming) and it's quite possible that something in that erase routine affects the write part, which is 64 bytes in the manual vs just 8 for mine. I haven't the time to go through that example in detail today, but experimenting will be done ASAP cheers -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics