Re: Gravitar

My experience has been - Old chips die. When they die, it's usually at
a single point. Erasing it won't fix it. I always erase a chip prior
to trying to write to it.
YMMV,

-Al-
andre wrote:
> ok..
> Do the 27 and 25's need to be erased prior to
> programming? Its really odd because I can read all
> chips fine (or so it says) but have a pile that will
> not program. One chip I can read, but when I compare
> to the image, it fails at about 49%. When I write to
> the chip, it fails at the same spot. If I open an
> unrelated image for a different position, it of course
> fails immediately in the compare...when I try to write
> that image, it fails immediately as well. I'm curious
> if it is a hardware failure in the chip, why it would
> fail at 2 different places...if its not hardware, why
> can't it write past the fail point? I'm wondering if
> its worthwhile to get an eraser now...
>
>
> --- COLIN DAVIES <colin.w.davies@btopenworld.com>
> wrote:
>
>
>> I think that's doable - You would need to check how
>> the extra pin was wired up... You may have to burn a
>> double image, which is probably a safe bet anyway.
>>
>> Cheers, Colin
>>
>> andre <livnfree_can@yahoo.com> wrote:
>> It looks like it reads ok...
>> If any of these chips don't compare against the rom
>> image and give an error, they will not program
>> beyond
>> that spot either...
>> Is it possible to use a larger size chip in place of
>> a
>> smaller one? ie. a 2732 in place of a 2716?
>>
>> p.s. your date is off quite a bit... trying some
>> software out? ;)
>>
>>
>> --- Mark Hooks wrote:
>>
>>
>>> If they are 2516s you should be able to read or
>>> program them as 2716s. Just
>>> use the 2716 setting on you programmer. They are
>>>
>> pin
>>
>>> compatible.
>>>
>>> Mark Hooks
>>> ----- Original Message -----
>>> From: "andre"
>>>
>>> To:
>>> Sent: Wednesday, April 11, 2007 11:23 PM
>>> Subject: VECTOR: Gravitar
>>>
>>>
>>>
>>>> Got my programmer in and tried it on a few
>>>>
>> chips..
>>
>>>> Unfortunately it can only do 27 series so I am
>>>>
>> out
>>
>>> of
>>>
>>>> luck on the 25's, of which I thought there were
>>>>
>>> only a
>>>
>>>> few.. anyways..after reseating the chips on the
>>>>
>>> Grav,
>>>
>>>> she fired up!
>>>>
>>>> Self test lists a problem in rom #6.. does
>>>>
>> anyone
>>
>>> do
>>>
>>>> programming of 25's?
>>>>
>>>> Second, in the diamond pattern test screen, the
>>>> diamonds are WAY outside of the white box and I
>>>>
>>> cannot
>>>
>>>> get them inside or centered...could this be part
>>>>
>>> of
>>>
>>>> that rom or does it point to other things? The
>>>>
>>> game
>>>
>>>> for the most part seems to play fine although I
>>>> 'think' your home system is supposed to be a
>>>>
>>> joined
>>>
>>>> circle...the ends on this one don't meet up...
>>>>
>>>>
>>>>
>>>>
>>>>
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>>>>
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Received on Fri Apr 13 12:46:50 2007