This doesn't surprise me.The reason the picstart plus programmer is deliberately called a 'DEVELOPEMENT' programmer and not a 'PRODUCTION' programmer is that it doesn't verify the memory at either end of the supply range;what 'works' at 5v doesn't ALWAYS work at 3v.This may be the cause,or it might be the dreaded 'silicon bug',early I.C.s had high reject rates; at one stage i read something abo= ut microchip having had a whole months production scrapped. ----- Original Message ----- From: "Mauricio Giovagnini" To: "Microcontroller discussion list - Public." Sent: Thursday, November 24, 2005 11:14 AM Subject: Re: [PIC] Ever seen PIC program memory "forget"? Heard about it with the Motorola 6811 and Hitachi 6811 (equivalents), but that was a while back concerning EEPROMs. Also heard Microchip had trouble with it's 1st flash versions which is why Atmel had a large lead on flash parts but I don't know if that is or was true and have nothing to back that up with. I experienced this with Atmel devices 89c51 on a very simple hardware designed by third party provider of the company I used to work. They worked ok until 'some day' where the program memory surprisingly got erased. Reprogramming solved the problem 'always'. Then I assume it was a problem with the FLASH of the Microcontroller or with the Power Circuit (but it was a 12V Vicor power supply with a 7805 whit its capacitors). Regarding the topic, I never experienced this kind of problems with a P= IC of any kind. --------------------------------- 1GB gratis, Antivirus y Antispam Correo Yahoo!, el mejor correo web del mundo Abr=ED tu cuenta aqu=ED -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist