They have now been posted on the MCHP web site at: http://www.microchip.com/10/Faqs/Example/CE51XV11/index.htm Scott ______________________________ Reply Separator _________________________________ Subject: Re: PIC12CE518/519 Author: PICLIST@MITVMA.MIT.EDU (Dr. Imre Bartfai) at Internet_Exchange Date: 5/11/99 10:59 PM Hi, I have had the same problem. I used the said code fragment. After inserting some NOPs it came out the EEPROM operation fails if the highest bit of the data to be written is 1, i. e. data GE 80h. Such way, I split the data in two nibbles and I write the nibbles with high nibble set to zero. Then it works. However, it is not very storage efficient method . Yesterday I took part on a Microchip seminar. The engineer said the problem is known and caused by some timing specification issue. They will post the corrected routine ASAP. I hope this helps. Imre On Mon, 10 May 1999, John Burkhardt wrote: > Has anyone been successful in writing to the on-board EEProm in these > parts? I have been able to simulate the operation with an external > EEProm using Microchip's code fragment. When I burn a part the > internal EEProm does not work. > > If anyone has had success with this part I would appreciate hearing > from you. > > Thanks > > > John Burkhardt > > jrburk@ibm.net > >