Altered beast arcade core with some wrong sound effects

Tulius
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Altered beast arcade core with some wrong sound effects

Unread post by Tulius »

There's something that bothering me about some sound effects in Altered Beast Mister arcade core and in MAME too... let me explain:
In these two action screens

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The electric wave and the electric bean sound the same but if push F2 and enter the sound test we know that the both is EFECT NO. 19, but the eletric bean should be EFECT NO. 18 just like MegaDrive version actually is. Is it possible to Jotego to fix it?

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Btw the music presentation is BGM NO. 06 but isn't played in game like MegaDrive version is.

What do you guys think about it?
gamesfan
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Re: Altered beast arcade core with some wrong sound effects

Unread post by gamesfan »

Well that’s interesting.
I guess arcade to mega drive isn’t a fair comparison. It’s very possible this issue exists in the real arcade pcb as well.
If mister and mame both do the same thing, this may be the case.
Perhaps the bug isn’t with the core but the version of the rom itself . Many times there are multiple revisions of games.
Tulius
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Re: Altered beast arcade core with some wrong sound effects

Unread post by Tulius »

Exactly what I think too, maybe out there exist a Sega Altered Beast arcade board not dumped yet with the correctly placed sounds, but right now in 2021 maybe it only exist in hands of a few collectors around the world if any.
Slipard
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Re: Altered beast arcade core with some wrong sound effects

Unread post by Slipard »

I wouldn't be surprised if that was a bug that never was corrected.
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Chris23235
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Re: Altered beast arcade core with some wrong sound effects

Unread post by Chris23235 »

Sounds more like a software bug to me too, had to be verified against a real machine. If it is a bug, it could be the basis for a hack "Altered Beast Corrected Sound"
XtraSmiley
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Re: Altered beast arcade core with some wrong sound effects

Unread post by XtraSmiley »

Very interesting. I’ll link this at A-P and see if the guys with real boards can test.

Posted, you can follow here or I'll post any useful replies back here.

https://www.arcade-projects.com/threads ... out.18738/
XtraSmiley
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Re: Altered beast arcade core with some wrong sound effects

Unread post by XtraSmiley »

So, after having someone test at least one set of ROMs, it seems this is an issue with the real PCB. Now we just need someone with the skills to fix it!
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darksakul
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Re: Altered beast arcade core with some wrong sound effects

Unread post by darksakul »

It is my great regret that we live in an age that is proud of machines that think and suspicious of people who try to.
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Re: Altered beast arcade core with some wrong sound effects

Unread post by XtraSmiley »

This is great, but won't solve this problem, as this exists on a real PCB.

Maybe @jotego can mess with it?
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Re: Altered beast arcade core with some wrong sound effects

Unread post by XtraSmiley »

This is great, but won't solve this problem, as this exists on a real PCB.

Maybe jotego can mess with it?

Deja vu?
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jotego
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Re: Altered beast arcade core with some wrong sound effects

Unread post by jotego »

This is a software problem. It can be solved with a ROM patch, which could go inside the MRA file. Maybe someone will write it...
Open IP for many chips in my github account
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Support new IP and core development here
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Re: Altered beast arcade core with some wrong sound effects

Unread post by XtraSmiley »

jotego wrote: Thu Sep 30, 2021 6:38 am This is a software problem. It can be solved with a ROM patch, which could go inside the MRA file. Maybe someone will write it...
Indeed. I was sort of hinting at the guy who fixed the slowdown in Double Dragon would give it a shot... :P

No worries though, I know you are super busy. As long as we know it's an actual arcade game programming error, maybe someday someone will fix it!
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