I came across this at the w/e http://www.sandisk.com/assets/docs/WP001_Flash_Management_Final_FINAL.pdf Not very encouraging And then I started wondering about the PIC's Flash longevity There's even mention of read disturb in SRAMs Is anything in my project going to last as long as I thought it would ? Do I need to be digging out the EPROMs ? Joe ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.5751 / Virus Database: 4311/9359 - Release Date: 03/22/15 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .