Good morning guys ... well it's morning here .. and I hope it's going= =20 to be good. Thanks for all the great suggestions We can pretty well put to rest the light theory, because the last few I=20 tried, I had the window covered before programming. Regarding the speed ... all these chips came out of working boards and=20 were simply erased and reprogrammed, so I know they have worked in their=20 target boards before. So that erases (sigh) the theory of counterfeit chips= .. I dont have a means of varying the verification voltage on this programmer= =20 unfortunately AFAIK. One of my PIC programmers does, but not this one. I've done the same process many times ... the last batch of these I did 6= 0=20 in one sitting. >> "Are the copies the same speed grade as the master?" I'm not sure about that. The master I used is itself a copy. Is it possible= =20 a higher speed master could cause this? I was assuming the speed was really= =20 only important to the operation of the target board ... ie if I used too= =20 slow ones for the target, they might not cough up their data quick enough=20 and crash the system. I just checked ... my master is a -12 and the others are -12 and -15's.= =20 I had also tried at least one -10, which didn't work either. I just realised I have an original factory EPROM with the new software ...= =20 I'll try copying from that. Dont forget that my 'master' still works perfectly in the target boards. >>It seems to me that the one thing that changed was "reloading the library= =20 >>on the Dataman S4" It's starting to look like that is where the problem lies, I just dont know= =20 what to do about it. I have reloaded the 'Library' a couple of times since,= =20 and while it reloads with no problem and shows all the different chip types= =20 in it's memory etc ... still no go. Well, thanks again, I shall go and check out a few more of the suggestions,= =20 and have a close look at the programmer itself. Regards, Roger ----- Original Message -----=20 From: "David Duffy (AVD)" To: "Microcontroller discussion list - Public." Sent: Thursday, August 05, 2010 6:54 AM Subject: Re: [EE] Eproms dont burn!! > alan.b.pearce@stfc.ac.uk wrote: >>> Mark E. Skeels wrote: >>> >>>> Dumb question: I don't suppose this eprom has a window? >>>> >>>> If so, did you cover it after programming? >>>> >>>> >>> Even if he didn't cover it, unless the board was under a UV light they >>> won't be erased in a hurry. >>> David... >>> >> >> True, but light is known to have funny effects without necessarily >> erasing the device, witness the problems people have with windowed PICs >> when they do not cover the window. >> > > Remember that we're talking about eproms here, not pic chips. > David... > > --=20 > ___________________________________________ > David Duffy Audio Visual Devices P/L > Unit 8, 10 Hook St, Capalaba 4157 Australia > Ph: +61 7 38235717 Fax: +61 7 38234717 > Our Web Site: www.audiovisualdevices.com.au > ___________________________________________ > > --=20 > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist ---------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.441 / Virus Database: 271.1.1/3049 - Release Date: 08/03/10=20 14:22:00 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .