Olin wrote: > I got a batch of 16F628 that didn't verify correctly at 3V > when programmed > correctly at 5V. They did verify correctly at 4V and 5.5V. I thought the OP was had a problem with bad RAM (Subject: "[PIC]:failed data location"), you seem to be talking about ROM/FLASH? To clarify, I've had a couple of PICs each with a couple of RAM locations which were 'stuck' at 0xFF. Nigel -- Nigel Orr, Design Engineer nigel@axoninstruments.co.uk Axon Instruments Ltd., Wardes Road, Inverurie, Aberdeenshire, UK, AB51 3TT Phone: +44 1467 622 332 Fax: +44 1467 625 235 http://www.axoninstruments.co.uk -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads