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Divemaster
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Reged: 07/14/09
Posts: 82
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Pepper2?
#391094 - 06/18/21 08:13 PM


Not 100% sure but I think there is supposed to be background music to this game.



ICEknight
MAME Fan
Reged: 07/06/15
Posts: 142
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Re: Pepper2? new [Re: Divemaster]
#391095 - 06/18/21 08:55 PM


> Not 100% sure but I think there is supposed to be background music to this game.

This looks like a possible regression:


Please report it at MameTesters, so that the devs will see it: https://mametesters.org/view_all_bug_page.php



Osso1
Reged: 10/17/04
Posts: 232
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Re: Pepper2? new [Re: ICEknight]
#391101 - 06/18/21 09:55 PM


The pepper2 set recently got a supposedly newer set of sound ROMs. With them it fails the self test.
I took a quick glance and I believe the recently added rev 2 sound ROMs are bad dumps. If compared to the old supposedly rev 1 ROMs they have the following changes.

5a: 1 byte change at 58d. Changes a LDA (a9) to a NOP (89). By changing this back the melody is restored but the game still fails the self test

6a: 2 bytes changed: 1f to 0f at 5ca, 2f to 0f at 22c

So 3 bytes changed total which cause the self test to fail and the first one also causes the melody to go missing.



Formerly (un)known as hanamichi on the mameworld.info message boards.



Haze
Reged: 09/23/03
Posts: 5162
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Re: Pepper2? new [Re: Osso1]
#391110 - 06/20/21 12:20 AM


> The pepper2 set recently got a supposedly newer set of sound ROMs. With them it fails
> the self test.
> I took a quick glance and I believe the recently added rev 2 sound ROMs are bad
> dumps. If compared to the old supposedly rev 1 ROMs they have the following changes.
>
> 5a: 1 byte change at 58d. Changes a LDA (a9) to a NOP (89). By changing this back the
> melody is restored but the game still fails the self test
>
> 6a: 2 bytes changed: 1f to 0f at 5ca, 2f to 0f at 22c
>
> So 3 bytes changed total which cause the self test to fail and the first one also
> causes the melody to go missing.

yes, those look like bitrot, should really have been checked before they went in..

we're going to see more and more redumps / new dumps where ROMs have gone rotten, they weren't built to last this long.



Vas Crabb
BOFH
Reged: 12/13/05
Posts: 4211
Loc: Melbourne, Australia
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Re: Pepper2? new [Re: Haze]
#391111 - 06/20/21 07:26 AM


> > The pepper2 set recently got a supposedly newer set of sound ROMs. With them it fails
> > the self test.
> > I took a quick glance and I believe the recently added rev 2 sound ROMs are bad
> > dumps. If compared to the old supposedly rev 1 ROMs they have the following
> changes.
> >
> > 5a: 1 byte change at 58d. Changes a LDA (a9) to a NOP (89). By changing this back the
> > melody is restored but the game still fails the self test
> >
> > 6a: 2 bytes changed: 1f to 0f at 5ca, 2f to 0f at 22c
> >
> > So 3 bytes changed total which cause the self test to fail and the first one also
> > causes the melody to go missing.
>
> yes, those look like bitrot, should really have been checked before they went in..
>
> we're going to see more and more redumps / new dumps where ROMs have gone rotten,
> they weren't built to last this long.

So can someone remove it and slap around the person who dumped it, as well as the person who pushed the change without checking it was sane?


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