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dave Borkowski

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Since: May 15, 2005
Posts: 4



(Msg. 1) Posted: Fri Jan 26, 2007 2:56 pm
Post subject: help running incomplete or bad checksum rom set
Archived from groups: alt>games>mame (more info?)
in an attempt to work on a pcb i am trying to run that game in mame with a
missing prom (bin) file in the rom set .zip and i get an error from mame
saying that it is missing. is there a way to force mame to start a game
with a missing file in that rom set so i can see how the game would react
without it. I do remember at one point there was a way to force a game to
run with an incorrect checksum but i cant seem to find that option.

I am using mame0111b

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waxman80014

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Since: Feb 15, 2005
Posts: 72



(Msg. 2) Posted: Fri Jan 26, 2007 2:56 pm
Post subject: Re: help running incomplete or bad checksum rom set [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
What game are you trying to run?

On Jan 26, 11:23 am, "dave Borkowski" <s... RemoveThis @drindustries.com> wrote:
> in an attempt to work on a pcb i am trying to run that game in mame with a
> missing prom (bin) file in the rom set .zip and i get an error from mame
> saying that it is missing. is there a way to force mame to start a game
> with a missing file in that rom set so i can see how the game would react
> without it. I do remember at one point there was a way to force a game to
> run with an incorrect checksum but i cant seem to find that option.
>
> I am using mame0111b

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dave Borkowski

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Since: May 15, 2005
Posts: 4



(Msg. 3) Posted: Fri Jan 26, 2007 5:56 pm
Post subject: Re: help running incomplete or bad checksum rom set [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
----- Original Message -----
From: <waxman80014.DeleteThis@hotmail.com>
Newsgroups: alt.games.mame
Sent: Friday, January 26, 2007 2:45 PM
Subject: Re: help running incomplete or bad checksum rom set


> What game are you trying to run?

i am trying to run winding heat. i know its a non working game in mame but
thats ok. with the complete rom set it dose boot to the rom check screen in
mame. and my pcb will not get that far. so the nonworking mame game is
more working than my pcb.
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DJSpeedy

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Since: Nov 29, 2006
Posts: 13



(Msg. 4) Posted: Fri Jan 26, 2007 7:22 pm
Post subject: Re: help running incomplete or bad checksum rom set [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"dave Borkowski" <spam DeleteThis @drindustries.com> wrote in message
news:tGuuh.28466$5l2.4654@fe02.news.easynews.com...

> i am trying to run winding heat. i know its a non working game in mame
but
> thats ok. with the complete rom set it dose boot to the rom check screen
in
> mame.

Games are "non-working" for a reason and there is nothing you can do to get
them to work.

Case closed.
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SINNER

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Since: Feb 03, 2005
Posts: 483



(Msg. 5) Posted: Sat Jan 27, 2007 12:56 am
Post subject: Re: help running incomplete or bad checksum rom set [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
* DJSpeedy wrote in alt.games.mame:

> "dave Borkowski" <spam.TakeThisOut@drindustries.com> wrote in message
> news:tGuuh.28466$5l2.4654@fe02.news.easynews.com...

>> i am trying to run winding heat. i know its a non working game in
>> mame but thats ok. with the complete rom set it dose boot to the rom
>> check screen in mame.

> Games are "non-working" for a reason and there is nothing you can do
> to get them to work.

> Case closed.

Fake checksum ROMS have been around for sometime. If he can create a
file that matches what MAME wants it will load the ROM.


--
David
Bank error in your favor. Collect $200.
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Roman Scherzer

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Since: Sep 01, 2005
Posts: 176



(Msg. 6) Posted: Sat Jan 27, 2007 2:55 am
Post subject: Re: help running incomplete or bad checksum rom set [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
> Fake checksum ROMS have been around for sometime. If he can create a
> file that matches what MAME wants it will load the ROM.

Well...MAME loads files by sha1 check as well....and I personally doubt
*he* is able to fake the SHA1 (even if rather fast SHA1 collision
algorithms were just published these days). Besides I don't see any
sense in making MAME load incomplete or bad sets....
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DJSpeedy

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Since: Nov 29, 2006
Posts: 13



(Msg. 7) Posted: Sat Jan 27, 2007 5:22 am
Post subject: Re: help running incomplete or bad checksum rom set [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"SINNER" <99nesorjd.RemoveThis@gates_of_hell.invalid> wrote in message
news:fj0r84x2v6.ln2@news.gates-of-hell.com...

> Fake checksum ROMS have been around for sometime. If he can create a
> file that matches what MAME wants it will load the ROM.

Still doesn't help if the driver itself is incomplete, which I can't say for
sure is the case here.

I suppose if he wants to take a crack at the source to try and make it
work - he's more than happy to. Smile
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Cerian Knight

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Since: Sep 20, 2005
Posts: 3



(Msg. 8) Posted: Wed Jan 31, 2007 9:42 pm
Post subject: Re: help running incomplete or bad checksum rom set [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Roman Scherzer <cmpro.RemoveThis@1und1.de> gyrated his joystick in a pattern that
spelled out:

>> Fake checksum ROMS have been around for sometime. If he can create a
>> file that matches what MAME wants it will load the ROM.
>
> Well...MAME loads files by sha1 check as well....and I personally doubt
> *he* is able to fake the SHA1 (even if rather fast SHA1 collision
> algorithms were just published these days). Besides I don't see any
> sense in making MAME load incomplete or bad sets....

An additional problem would be the unknown values a real board would 'find'
instead of the missing PROM values. Probably FF across the board, but I
wouldn't bet on it. Whether the PROM is executable code or just data would
make no difference here, as reading the wrong missing data could yield a
different result. If the Boot PROM is missing, it wouldn't make any
difference trying to emulate anyway...no Boot PROM, no anything except
maybe raster.

--
C
E
R
I
A
N
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