Re: '90 Calpaks and PROMs

["TRAX" <trax@frederickmd.com>]

Thanks Roger.  That explains a lot!

Tim


----- Original Message -----
From: Roger Heflin <rah@horizon.hit.net>
To: <gmecm@diy-efi.org>
Sent: Monday, May 01, 2000 5:45 PM
Subject: Re: '90 Calpaks and PROMs


>
>
> On Mon, 1 May 2000, TRAX wrote:
>
> > Sorry for so many questions ... I'm just getting my bearings here ...
> >
> > > don't remove the cover from the window
> >
> > What cover and what window?
> >
> > > I remove the top,
> >
> > Cool ... the blue top to the carrier correct?
> >
> > > remove the electrical tape from the eprom window
> >
> > What is the 'eprom' window?  Is this one of the circular cutouts in the
blue
> > cover?  I don't have any electrical tape on mine.  Did you put it there?
If
> > so, why?
> >
>
> Under the blue cover there is a black chip with about 28 pins, there
> is a sticker on the top of it, it is covering a window in the chip,
> you cannot erase the chip with this window covered, as the light won't
> get to the circuits that are the eprom.
>
> Also, if you do not recover the window sunlight can erase/degrade the
> chip and it will lose its data and if exposed for long enough will no
> longer be programmable at all, so it is very important to keep it
> covered.
>
> Roger
>
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