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MAME's OPL emulation
#311700 - 07/20/13 04:52 PM
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MAME's opl emulators are using wrong key scale level:
0.0 dB/oct, 1.5 dB/oct, 3.0 dB/oct, 6.0 dB/oct instead of
0.0 dB/oct, 3.0 dB/oct, 1.5 dB/oct, 6.0 dB/oct
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Re: MAME's OPL emulation
[Re: Alexey]
#311702 - 07/20/13 06:36 PM
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> MAME's opl emulators are using wrong key scale level:
>
> 0.0 dB/oct, 1.5 dB/oct, 3.0 dB/oct, 6.0 dB/oct instead of
> 0.0 dB/oct, 3.0 dB/oct, 1.5 dB/oct, 6.0 dB/oct
Wrong according to what?
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Re: MAME's OPL emulation
[Re: Phil Bennett]
#311718 - 07/21/13 03:20 AM
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YMF262(OPL3) Datasheet
YMF278B(OPL4) Application manual
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Re: MAME's OPL emulation
[Re: Alexey]
#311736 - 07/21/13 03:28 PM
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> YMF262(OPL3) Datasheet
> YMF278B(OPL4) Application manual
I see. Has this been verified on a real chip? There are many mistakes in Yamaha's datasheets and MAME's OPL emulation incorporates a lot of research based on experiments with real hardware.
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Re: MAME's OPL emulation
[Re: Phil Bennett]
#311738 - 07/21/13 05:36 PM
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Re: MAME's OPL emulation
[Re: Alexey]
#311752 - 07/22/13 12:55 AM
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| R. Belmont |
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Cuckoo for IGAvania
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Re: MAME's OPL emulation
[Re: Phil Bennett]
#311775 - 07/22/13 04:51 PM
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> > Yes. I verified.
> > Doom 2 MAP 09
> > MAME's emulation(SkullTag):
> > http://www.youtube.com/watch?v=Ms5xEbzDHtc
> > Real OPL(SB16):
> > http://www.youtube.com/watch?v=_RFd_rq0uvA
>
> Great, thanks. I'll see to it that it gets fixed.
Fair warning: most GPL projects like SkullTag use a very, very old version of MAME's FM which predates a lot of the quality work we've put into it since, oh, 2003 or so 
People who've A/B'ed current MAME OPL with hardware via DOSBox generally don't show the sorts of obvious errors that Alexey's samples here do.
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Re: MAME's OPL emulation
[Re: Alexey]
#311777 - 07/22/13 06:09 PM
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For about two years ago so did i compare an MAME recording and an arcade PCB recording i had done from the game Vimana and i could not hear any difference at all.
Now i don't know about skulltag but never compare OPL2 with OPL3 as they sound different, not so obvious in some music while others sound totally different on OPL3 compared to OPL2.
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| R. Belmont |
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> For about two years ago so did i compare an MAME recording and an arcade PCB
> recording i had done from the game Vimana and i could not hear any difference at all.
>
> Now i don't know about skulltag but never compare OPL2 with OPL3 as they sound
> different, not so obvious in some music while others sound totally different on OPL3
> compared to OPL2.
Vimana doesn't have sound emulation in MAME?
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Re: MAME's OPL emulation
[Re: R. Belmont]
#311779 - 07/22/13 06:41 PM
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oops... :-)
I am getting senile... i cant even remember the name, but it was a game that uses OPL2 and i am sure it was a Toaplan game... now i don't dare to say any exact title ;-)
>
> Vimana doesn't have sound emulation in MAME?
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| AWJ |
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Re: MAME's OPL emulation
[Re: Phil Bennett]
#311784 - 07/22/13 11:39 PM
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> > Here's the MESS 0.149u1 OPL2 rendition of Into Sandy's City
>
> Can we get before and after recordings to verify that this change really does make
> the difference?
Oh ye of little faith...
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| R. Belmont |
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Cuckoo for IGAvania
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Re: MAME's OPL emulation
[Re: Phil Bennett]
#311790 - 07/23/13 01:47 AM
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> > > Here's the MESS 0.149u1 OPL2 rendition of Into Sandy's City
> >
> > Can we get before and after recordings to verify that this change really does make
> > the difference?
>
> Oh ye of little faith...
Can you post it in some normal format? It's super-hard to play flac on Linux even though it's allegedly open-source. I have no idea why.
Edited by R. Belmont (07/23/13 01:47 AM)
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| redk9258 |
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Regular
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Here ya go.
I don't know why, but there is a huge DC offset in the file...
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I recorded MESS output, after fixing ksl.
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| R. Belmont |
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Cuckoo for IGAvania
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Re: MAME's OPL emulation
[Re: redk9258]
#311836 - 07/23/13 05:29 PM
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> Here ya go.
>
> I don't know why, but there is a huge DC offset in the file...
Thanks.
There's definitely bad distortion in there due to the DC offset. I assume this is recorded from the MESS PC driver? Anything with a speaker or DAC output causes DC offsets bad in MAME/MESS. Real h/w couples the output through a capacitor to block that normally but we don't have any equivalent.
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Re: MAME's OPL emulation
[Re: R. Belmont]
#311841 - 07/23/13 06:59 PM
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> > > Yes. I verified.
> > > Doom 2 MAP 09
> > > MAME's emulation(SkullTag):
> > > http://www.youtube.com/watch?v=Ms5xEbzDHtc
> > > Real OPL(SB16):
> > > http://www.youtube.com/watch?v=_RFd_rq0uvA
> >
> > Great, thanks. I'll see to it that it gets fixed.
>
> Fair warning: most GPL projects like SkullTag use a very, very old version of MAME's
> FM which predates a lot of the quality work we've put into it since, oh, 2003 or so
>
> People who've A/B'ed current MAME OPL with hardware via DOSBox generally don't show
> the sorts of obvious errors that Alexey's samples here do.
Skulltag is no longer maintained.
They're now working on it over here:
http://zandronum.com/
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