Re: Gravitar

Thanks Mark. I only have one case where I am forced
until I get my chips in to use a larger size...it will
not program with the smaller image. I have read
elsewhere that you need to double the image inside the
larger chip? If so do I just use a hex editor and
paste the data below the original and save? Its been a
looong time since I did this end of things. Its rom
413 on battlezone and whomever did it before lifted a
pin and tied it to a 74ls139 at M2.

--- Mark Hooks <markhooks@earthlink.net> wrote:

> Amazing how long the software trial lasts if the
> clock is off.
>
> Swapping to a larger eprom is possible. Keeping the
> pinouts and voltages
> straight is the main key. Speed of the eprom is also
> important. You can go
> faster but not slower. I attached a comparison sheet
> that shows some common
> ones. Some boards are set up for various jumpers to
> swap from one eprom to
> another.
>
> Mark
> ----- Original Message -----
> From: "andre" <livnfree_can@yahoo.com>
> To: <vectorlist@vectorlist.org>
> Sent: Friday, April 13, 2007 11:04 AM
> Subject: Re: VECTOR: Gravitar
>
>
> > 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 <markhooks@earthlink.net> 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" <livnfree_can@yahoo.com>
> >> To: <vectorlist@vectorlist.org>
> >> 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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> >> > chris@westnet.com
> >>
> >>
> >
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---------------------------------
Common EPROM Pinouts

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Received on Fri Apr 13 21:38:07 2007