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'Desprotect PIC16C84'
1997\09\29@130311 by WF AUTOMA‚̀O

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Does someone know how to desprotect a EEPROM of PIC16C84?

       Thank's!

       Mig.

1997\09\29@150838 by Steve Smith

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The EErom on an 84 is not protected only the code aera is protectable AFIK.

Cheers Steve.....

1997\09\29@163550 by WF AUTOMA‚̀O

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Steve Smith wrote:
>
> The EErom on an 84 is not protected only the code aera is protectable AFIK.
>
> Cheers Steve.....

Sorry! I did reference for PROGRAM OF EEPROM if it's protected! I see in
somewhere that it's a
problem of 16C84!

Miguel.

1997\09\29@173401 by Mike Keitz

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On Mon, 29 Sep 1997 14:10:12 -0700 WF AUTOMA=?iso-8859-1?Q?=C7=C3O ?=
<spam_OUTwfTakeThisOuTspamAMBIENTE.COM.BR> writes:
>Does someone know how to desprotect a EEPROM of PIC16C84?

The method reported a couple of years ago was to raise Vdd to about 12V,
go into programming mode and write 1 to the CP bit several times.  Upon
lowering Vdd to normal range, the chip could be read unprotected, both
the program and data EEPROM.  I never tried it though.

1997\09\29@173823 by Eric van Es

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WF AUTOMA‚ÌO wrote:

> Steve Smith wrote:
> >
> > The EErom on an 84 is not protected only the code aera is protectable AFIK.
> >
> > Cheers Steve.....
>
> Sorry! I did reference for PROGRAM OF EEPROM if it's protected! I see in
>  somewhere that it's a
> problem of 16C84!
>
> Miguel.

Yip. Best solution is not to protect it ! Stupid solution, but apparently MChip
advises one to only enable the CP flag the FINAL final program!

Cheers!

--
Eric van Es               | Cape Town, South Africa
.....vanesKILLspamspam@spam@ilink.nis.za | http://www.nis.za/~vanes
LOOKING FOR TEMPORARY / HOLIDAY ACCOMODATION?
http://www.nis.za/~vanes/accom.htm

1997\09\29@175648 by John Payson

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> On Mon, 29 Sep 1997 14:10:12 -0700 WF AUTOMA=?iso-8859-1?Q?=C7=C3O ?=
> <wfspamKILLspamAMBIENTE.COM.BR> writes:
> >Does someone know how to desprotect a EEPROM of PIC16C84?
>
> The method reported a couple of years ago was to raise Vdd to about 12V,
> go into programming mode and write 1 to the CP bit several times.  Upon
> lowering Vdd to normal range, the chip could be read unprotected, both
> the program and data EEPROM.  I never tried it though.

I've also read that that 'exact' method is a trap (something to try to
entice people to blow up chips, maybe?) but that at least for the older
parts there were related methods that did work (my conjecture would be
that the best goal would be to play VDD games to "trick" the part into
thinking it's not code-protected, but that would require a lower VDD
rather than a higher one).  With the newer 'F84 parts, the old methods
of cracking supposedly no longer work, but I have no idea whether new
ones exist.

1997\09\30@012742 by Mike Keitz

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On Mon, 29 Sep 1997 16:46:21 -0500 John Payson <.....supercatKILLspamspam.....MCS.NET> writes:
>> On Mon, 29 Sep 1997 14:10:12 -0700 WF AUTOMA=?iso-8859-1?Q?=C7=C3O
>?=
>> <EraseMEwfspam_OUTspamTakeThisOuTAMBIENTE.COM.BR> writes:
>> >Does someone know how to desprotect a EEPROM of PIC16C84?
>>
>> The method reported a couple of years ago was to raise Vdd to about
>12V,
>> go into programming mode and write 1 to the CP bit several times.
>Upon
>> lowering Vdd to normal range, the chip could be read unprotected,
>both
>> the program and data EEPROM.  I never tried it though.
>
>I've also read that that 'exact' method is a trap (something to try to
>entice people to blow up chips, maybe?) but that at least for the
>older
>parts there were related methods that did work

I'm not presenting this as an exact method, or recommending anyone try
it, since I don't remember what the exact method was.  There were reports
that  simply raising Vdd and letting fly was likely to damage the PIC, so
enhancements such as letting the chip "cool down" for a few minutes at
various stages in the process, etc. were presented.  I didn't attempt any
of this, my interest was just that a method did exist using readily
available hacker technology, thus I couldn't consider the code and data
in a C84 to be secure.

1997\09\30@071146 by Clewer,Brian

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Steve Wrote:

>The EErom on an 84 is not protected only the code aera is protectable AFIK.
>
>Cheers Steve.....


I think you will find that the EEprom   WILL be protected from reading with
a prgrammer, but you still will be able to read and write to it from your
code in your program.

Regards,
Brian.


'Desprotect PIC16C84'
1998\06\14@215602 by WF AUTOMACAO
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Who was offering services for desprotect PIC16C84? Or have a
circuit to desprotect?

       MAW.

1998\06\16@000959 by Frans Gunawan

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<x-rich><bigger>----------

> From: WF AUTOMACAO
<<<underline><color><param>0000,0000,ffff</param>wfspamspam_OUTAMBIENTE.COM.BR</color></und> erline>>

> To:
<underline><color><param>0000,0000,ffff</param>
@spam@PICLISTKILLspamspamMITVMA.MIT.EDU

</color></underline>> Subject: Desprotect PIC16C84

{Quote hidden}

</bigger>

try this:

DELLFERN, tel 0384 444570, fax:0384 444571

on their advertisement(ETI magazine february 1995, United Kingdom): we
can copy any commercially available protected devices even if security
fused or code locked. pal,gal,pic,mpu,etc

goodluck



http://www.poboxes.com/f

f

</x-rich>

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