Re: Re[2]: Re[2]: Gravitar

Ahhh.. I see.. used to Atmels and pics that just write
over.
Looking for UV lamp as we speak..

--- peter jones <highwayman2000@mail.ru> wrote:

>
> -----Original Message-----
> From: andre <livnfree_can@yahoo.com>
> To: vectorlist@vectorlist.org
> Date: Fri, 13 Apr 2007 10:10:38 -0700 (PDT)
> Subject: Re: VECTOR: Re[2]: VECTOR: Gravitar
>
> >
> > Also, I can read all of these chips ok (that
> fail),
> > and then program them with what I have read and it
> > works to 100% and verifies ok... But if I try to
> open
> > a proper image, it will fail.
> > Maybe its a junk programmer...
>
> no, you just dont have a clue how eproms work, or
> how to use them.
>
> if you erase one all bits are set to "1"
> when they are programmed some bits get set to "0".
>
> if you try to write an image to the chip that's
> already in it the programmer will send each byte,
> then read it back & compare the 2.
> because it came from it in the first place it will
> verify o.k.
> but if there is a bit different it will fail because
> it can change a "1" to a "0" but not the other way
> around.
>
>
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Received on Fri Apr 13 14:18:44 2007