Post by thread:OTP erase

David BALDWIN <David BALDWIN <spam_OUTPICLISTTakeThisOuTMITVMA.MIT.EDU>> wrote: > I am going to try if OTP parts can be erased with radiations or X > rays. Does someone already tried this? David: Yes, someone has. Contrary to popular opinion, it doesn't work. -Andy === Andrew Warren - .....fastfwdKILLspam@spam@ix.netcom.com === Fast Forward Engineering - Vista, California === http://www.geocities.com/SiliconValley/2499 === For PICLIST help (including "unsubscribe" instructions), === put the single word "help" in the body of a message and === send it to: listservKILLspammitvma.mit.edu

At 12:10 AM 14/8/97 -0800, you wrote: >David BALDWIN <David BALDWIN <.....PICLISTKILLspam.....MITVMA.MIT.EDU>> wrote: > >> I am going to try if OTP parts can be erased with radiations or X >> rays. Does someone already tried this? > >David: > >Yes, someone has. Contrary to popular opinion, it doesn't work. maybe not for PIC's but for most OTP memory it *does* work. It takes a lotsa X-ray: a machine used for that purposes is left working for 30..90 minutes at maximum power with the emitter head few millimeters from the chip bodies. The guy who has this machinery in his cellar said that all OTP EPROM's have been erased. time*energy depends on manufacturer. Also some Intel micros have been erased. He has not tried PIC's. I would *not* advise to do such experiments in rural areas. antti No Limits Go To Basics of AVR AVR AVRBASIC http://www.avrbasic.com Born for Basic Grand opening in August. Watch out for first week offers.

>I would *not* advise to do such experiments in rural areas. Why not in rural areas? Nobody around to see you glow... <G> Has anybody tried nuclear sources, though? I mean, this part of the country is known for uranium and radium deposits, so ... Andy ================================================================== Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865 Hardware & Software for Industry & R/C Hobbies "Go fast, turn right, and keep the wet side down!" ==================================================================

Antti Lukats wrote: {Quote hidden}> > At 12:10 AM 14/8/97 -0800, you wrote: > >David BALDWIN <David BALDWIN <EraseMEPICLISTspam_OUTTakeThisOuTMITVMA.MIT.EDU>> wrote: > > > >> I am going to try if OTP parts can be erased with radiations or X > >> rays. Does someone already tried this? > > > >David: > > > >Yes, someone has. Contrary to popular opinion, it doesn't work. > > maybe not for PIC's but for most OTP memory it *does* work. > > It takes a lotsa X-ray: a machine used for that purposes is left > working for 30..90 minutes at maximum power with the emitter head > few millimeters from the chip bodies. > > The guy who has this machinery in his cellar said that all OTP > EPROM's have been erased. time*energy depends on manufacturer. > Also some Intel micros have been erased. He has not tried PIC's. > > I would *not* advise to do such experiments in rural areas. > > antti > > No Limits Go To > Basics of AVR AVR > AVRBASIC http://www.avrbasic.com Born for Basic > > Grand opening in August. > Watch out for first week offers. Anybody tried Microwave ovens ??? ;-) Nic

Andy Kunz wrote: > > >I would *not* advise to do such experiments in rural areas. > > Why not in rural areas? Nobody around to see you glow... <G> > > Has anybody tried nuclear sources, though? I mean, this part of the > country is known for uranium and radium deposits, so ... Why not just turn them around and use the other side...(Just like a vinyl LP record) -- Friendly Regards Tjaart van der Walt tjaartspam_OUTwasp.co.za ________________________________________________________ | WASP International http://wasp.co.za | | R&D Engineer : GSM peripheral services development | |Vehicle tracking | Telemetry systems | GSM data transfer| |Voice : +27-(0)11-622-8686 | Fax : +27-(0)11-622-8973 | | WGS-84 : 26010.52'S 28006.19'E | |________________________________________________________|

Nic van der Walt <Nic van der Walt <@spam@nvdwKILLspamwasp.co.za>> wrote: > Anybody tried Microwave ovens [for erasing OTP PICs]??? Uh, no. You also can't erase PICs by putting them in a magnetic field, accelerating them to significant fractions of the speed of light, playing loud music at them, holding them under water, shaking them vigorously, or tapping on them with small hammers. Surprising, huh? -Andy === Andrew Warren - KILLspamfastfwdKILLspamix.netcom.com === Fast Forward Engineering - Vista, California === http://www.geocities.com/SiliconValley/2499 === For PICLIST help (including "unsubscribe" instructions), === put the single word "help" in the body of a message and === send it to: RemoveMElistservTakeThisOuTmitvma.mit.edu

I have read that some people have had success erasing OTP devices with very high (industrial) levels of x-rays. Medical x-ray machines are designed for minimum exposure, so they would not work (or would take a year to erase a device), but one of the machines that, for instance, checks pipeline welds for defects might do the trick. Of course, the radiation might fry the logic circuits, but at least your device would be erased ;-) CIAO - Martin R. Green spamBeGoneelimarspamBeGonebigfoot.com ---------- From: Andy Kunz[SMTP:TakeThisOuTmontanaEraseMEspam_OUTFAST.NET] Sent: Thursday, August 14, 1997 8:31 AM To: RemoveMEPICLISTTakeThisOuTMITVMA.MIT.EDU Subject: Re: OTP erase >I would *not* advise to do such experiments in rural areas. Why not in rural areas? Nobody around to see you glow... <G> Has anybody tried nuclear sources, though? I mean, this part of the country is known for uranium and radium deposits, so ... Andy ================================================================== Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865 Hardware & Software for Industry & R/C Hobbies "Go fast, turn right, and keep the wet side down!" ==================================================================

>Has anybody tried nuclear sources, though? I mean, this part of the >country is known for uranium and radium deposits, so ... Yes experiments are made. most chips were fried before erase. One 8751 style thing survived the erasure with some minor trouble in logic circuitry. antti No Limits Go To Basics of AVR AVR AVRBASIC http://www.avrbasic.com Born for Basic Grand opening in August. Watch out for first week offers.

At 08:31 AM 8/14/97 -0400, you wrote: >>I would *not* advise to do such experiments in rural areas. > >Why not in rural areas? Nobody around to see you glow... <G> > >Has anybody tried nuclear sources, though? I mean, this part of the >country is known for uranium and radium deposits, so ... > Probably can't get the flux levels you would need. Maybe you could dig some up, mail (UPS is on strike) it to Savanna River SC and let them enrich it for you :-) Seriously though, the levels needed would require shielding and control of the dose of radiation that you got. An iteresting study would be to see what different sources of radiation could cause the best erase. I would guess that a source that gave off gamma's at about the same energy level as the UV light would work fine. Wonder what kind of shielding the package adds? Probably the best method would to be to etch a hole in the package and use a light. Norm

Andrew Warren <fastfwdEraseME.....IX.NETCOM.COM> wrote: > You also can't erase PICs by putting them in a magnetic field, > accelerating them to significant fractions of the speed of > light, playing loud music at them, holding them under water, > shaking them vigorously, or tapping on them with small hammers. However, *sufficient* application of any of these methods will render it impossible to determine whether the PIC is erased or not.

Eric Smith <EraseMEPICLISTMITVMA.MIT.EDU> wrote: > > You also can't erase PICs by putting them in a magnetic field, > > accelerating them to significant fractions of the speed of > > light, playing loud music at them, holding them under water, > > shaking them vigorously, or tapping on them with small hammers. > > However, *sufficient* application of any of these methods will > render it impossible to determine whether the PIC is erased or not. Yeah... And the really neat thing is that you achieve the same result whether you apply those methods to the PIC or to the guy trying to erase it. -Andy === Andrew Warren - RemoveMEfastfwdEraseMEEraseMEix.netcom.com === Fast Forward Engineering - Vista, California === http://www.geocities.com/SiliconValley/2499 === For PICLIST help (including "unsubscribe" instructions), === put the single word "help" in the body of a message and === send it to: RemoveMElistservspam_OUTKILLspammitvma.mit.edu

In message <RemoveME199708141303.IAA04879TakeThisOuTspamdfw-ix10.ix.netcom.com>> EraseMEPICLISTspamspamBeGoneMITVMA.MIT.EDU writes: > Nic van der Walt <Nic van der Walt <RemoveMEnvdwKILLspamwasp.co.za>> wrote: > > > Anybody tried Microwave ovens [for erasing OTP PICs]??? > > Uh, no. > > You also can't erase PICs by putting them in a magnetic field, > accelerating them to significant fractions of the speed of > light, playing loud music at them, holding them under water, > shaking them vigorously, or tapping on them with small hammers. How about LARGE! hammers :-). Nigel. /--------------------------------------------------------------\ | Nigel Goodwin | Internet : nigelgSTOPspamspam_OUTlpilsley.demon.co.uk | | Lower Pilsley | Web Page : http://www.lpilsley.demon.co.uk | | Chesterfield | | | England | | \--------------------------------------------------------------/

For anyone thats interested, my mother-in-law will breathe on any otp's you want erased for a small fee. We don't call her dragon's breath for nothing! 8-) On Thu, 14 Aug 1997, Andrew Warren wrote: {Quote hidden}> Nic van der Walt <Nic van der Walt <spamBeGonenvdwSTOPspamEraseMEwasp.co.za>> wrote: > > > Anybody tried Microwave ovens [for erasing OTP PICs]??? > > Uh, no. > > You also can't erase PICs by putting them in a magnetic field, > accelerating them to significant fractions of the speed of > light, playing loud music at them, holding them under water, > shaking them vigorously, or tapping on them with small hammers. > > Surprising, huh? > > -Andy > > === Andrew Warren - KILLspamfastfwdspamBeGoneix.netcom.com > === Fast Forward Engineering - Vista, California > === http://www.geocities.com/SiliconValley/2499 > > === For PICLIST help (including "unsubscribe" instructions), > === put the single word "help" in the body of a message and > === send it to: EraseMElistservEraseMEmitvma.mit.edu >

>For anyone thats interested, my mother-in-law will breathe on any otp's >you want erased for a small fee. We don't call her dragon's breath for >nothing! 8-) Don't you mean the laser beam eyes that can kill a son-in-law at 10 paces ? Every married man on the PicList will know what I mean ! :-)