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'UV-Erasing of JW PIC4s ?'
1998\08\20@120133 by Stefan Sczekalla-Waldschmidt

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Hi,

Can I erase JW Type PIC4s as I erased EPROM4s ?
Or do I have something special to keep in mind ?

Kind regards

       Stefan Sczekalla-Waldschmidt
       spam_OUTsswTakeThisOuTspamoikossw.de

1998\08\20@122441 by Thomas Magin

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At 17:47 20.08.98 +0100, you wrote:
>Hi,
>
>Can I erase JW Type PIC4s as I erased EPROM4s ?

Yes.

>Or do I have something special to keep in mind ?

Not really. Maybe that it doesn't take such a long time (several minutes,
depends on the erasing device) as erasing EPROMs

So long

Thomas
=8-)

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1998\08\20@124729 by Mike Keitz

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On Thu, 20 Aug 1998 17:47:08 +0100 Stefan Sczekalla-Waldschmidt
<sswspamKILLspamOIKOSSW.DE> writes:
>Hi,
>
>Can I erase JW Type PIC4s as I erased EPROM4s ?
>Or do I have something special to keep in mind ?

They erase just like EPROMs, because part of the chip is an EPROM.  The
rest of the chip is pretty much unaffected by UV.  Newer chips tend to
require more light to erase than early-model ones, because the memory
cells are packed into a denser array.  Thus you should experiment to find
out how much time in your eraser is required for the particular PICs you
have.  Then use at least double that time, since "ghosts" of an
incompletely erased program can come back to haunt you.  Be sure the PIC
windows are clean before each erase, and place them as close to the bulb
as you can.

You can go from mistake to blank faster by "pipelining" 2 or 3 PICs
through the eraser.  Each erase cycle is shorter because the chip you
finally remove has been exposed to 2 or 3 cycles.  Of course the cost of
this is the need to have extra PICs.

Important:  Never set the Code Protect bit on a JW PIC.  It is designed
to be difficult or impossible to erase in order to make piracy harder.
If the CP bit isn't erased, the chip is useless because it can't be
reprogrammed.

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1998\08\21@082727 by Peter L. Peres

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On Thu, 20 Aug 1998, Stefan Sczekalla-Waldschmidt wrote:

> Can I erase JW Type PIC4s as I erased EPROM4s ?
> Or do I have something special to keep in mind ?

In my experience it is exactly the same, except PICs are better left in
longer, with the same lamp (30-50% longer). This may be caused by my
lamp's geometry however.

Peter

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