New Documentation: An authoritative reference on the YM2612

For anything related to sound (YM2612, PSG, Z80, PCM...)

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TmEE co.(TM)
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Post by TmEE co.(TM) » Sat Oct 11, 2008 5:04 pm

Seems I've got do some hardware recording... Battletech track 12, right ?
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AamirM
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Post by AamirM » Sat Oct 11, 2008 5:51 pm

Yes thats it.

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Post by Snake » Sun Oct 12, 2008 2:31 am

TmEE co.(TM) wrote:Seems I've got do some hardware recording... Battletech track 12, right ?
Well It'd be interesting. Your machine(s) are heavily modified, right? If you can get something that sounds as bad as what Aamir posted, please do tell...

I can tell you that it was not meant to sound like that. All GEMS stuff was created on very early model 1 consoles (it required the EXT port on the back) and that track does not sound like that on such consoles.

Given that this sound is way out of spec, its possible it sounds completely wrong on some later model console that doesnt use a real YM2612. Doesn't change the fact that it's not supposed to sound like that.

I have a sample somewhere, I'm trying to find it.

[edit]Here we go.

But, yes. There is a lot more to this bug.

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Post by Eke » Sun Oct 12, 2008 9:51 am

cool, I got it sounding exactly like your sample :wink:

I don't want to imagine the moment when we would be emulating specific Mega Drive & Genesis revisions :roll:

TmEE co.(TM)
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Post by TmEE co.(TM) » Sun Oct 12, 2008 10:59 am

http://www.fileden.com/files/2008/4/21/ ... Tech12.ogg

My unmodded MD1 sounds same, except it has more noise because of the stonger "ladder effect".

Regen sounds way off, Fusion is not quite correct either, and Gens, well it blips :P Didn't try other emulators...
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Post by AamirM » Sun Oct 12, 2008 11:41 am

Hi,
TmEE co.(TM) wrote: Regen sounds way off, Fusion is not quite correct either, and Gens, well it blips Razz Didn't try other emulators...
Hah :) . Now I can safetly say that it doesn't sound weird to me without me being getting called a wierdo :D . Now I wonder whats causing that.
TmEE co.(TM) wrote: Regen sounds way off, Fusion is not quite correct either,
Thats because they both are producing the detune bug. At least thats what the real thing should do. Can you also listen to ComixZone track 5 on the same machine and see if it produces this bug there as well because it uses pretty much the same settings on channel 3. Now I 100% know that comixzone shouldn't produce this thing and which will make things more interesting ;) .

stay safe,

AamirM

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Post by Eke » Sun Oct 12, 2008 2:45 pm

What is interesting is that we got two samples from hardware that sounds VERY differently: could it be that one is running on a PAL Mega Drive and the other one on a NTSC Genesis ? Or could the output circuitry from one or another filters frequency in a different way ?

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Post by AamirM » Sun Oct 12, 2008 3:03 pm

Hi,
What is interesting is that we got two samples from hardware that sounds VERY differently: could it be that one is running on a PAL Mega Drive and the other one on a NTSC Genesis ? Or could the output circuitry from one or another filters frequency in a different way ?
Yeah, could be it. I think Battletech was only meant to be run on NTSC machines.

stay safe,

AamirM

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Post by TmEE co.(TM) » Sun Oct 12, 2008 3:10 pm

My MD2 was with NTSC master clock and 50Hz setting, I tried other combinations and there's no difference in sound (except speed). Also my Nomads and Christuserloeser's X'eye and Wondermega sound same (as all are MD2 basically). Unmodified MD2 that's same model as my primary use one sounds same. I'll do a recording of the MD1 aswell... and while at it, I have a SE-95 YM2612 clone chip, I've socketed my MD1s YM2612, and do a recording of that aswell then.
I'll make a record of the Comix Zone track 5... I don't recall it well anymore, but if you expect it to do the blip sound, it won't... same goes for Flashback, Bloodshot (nothing more coming to mind). The bug is very specific I think.
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Post by Christuserloeser » Sun Oct 12, 2008 3:45 pm

I think it's the early Yamaha 2612s that do sound correctly with GEMS - like Steve Snake said. The SEGA developed 2612 clones used in later MD1s and all MD2 based hardware will sound similar to what TmEE recorded.

TmEE co.(TM) wrote:I'll do a recording of the MD1 aswell... and while at it, I have a SE-95 YM2612 clone chip, I've socketed my MD1s YM2612, and do a recording of that aswell then.
Is that the one from the Scorpion/AITO ? I would love to hear some recordings done with this chip! :D
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TmEE co.(TM)
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Post by TmEE co.(TM) » Sun Oct 12, 2008 4:02 pm

My MD1 is the early kind without TMSS, same as what HardWareMan has, except not so modded :) It has regular Yamaha YM2612 chip in it...

And the SE-95 is from the AITO (which seems to have a dead functional part in it.....). SE-95 has higher output levels compared to real YM2612 and its sound seemed cleaner... I'll do some recordings soon.
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Post by AamirM » Sun Oct 12, 2008 5:31 pm

Hi,
I think it's the early Yamaha 2612s that do sound correctly with GEMS - like Steve Snake said. The SEGA developed 2612 clones used in later MD1s and all MD2 based hardware will sound similar to what TmEE recorded.
No. Its just this game. I had a PAL MD and I know that ComixZone track 5 doesn't sound like that. I also have ran ComixZone on a chinese clone MD (one with the 132-in-1 logo, there seem to be like hundred types of them :) ) and that sounds correct as well. So I am guessing this game is doing something different. Too bad both systems are busted now :( (chinese one was expected).

stay safe,

AamirM

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Post by TmEE co.(TM) » Sun Oct 12, 2008 5:37 pm

http://www.fileden.com/files/2008/4/21/ ... CRDNGS.RAR

CCAM MD2, MD1 with YM2612 and MD1 with SE-95 clone chip... seems MD2 YM2612 implementation does sound different with BattleTech... I still prefer MD2 over anything.
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Post by AamirM » Sun Oct 12, 2008 5:56 pm

Hi,
CCAM MD2, MD1 with YM2612 and MD1 with SE-95 clone chip... seems MD2 YM2612 implementation does sound different with BattleTech... I still prefer MD2 over anything.
Thanks man ;) . I'd say Regen sounds closer to MD1 w/ YM2612.

stay safe,

AamirM

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Post by Eke » Sun Oct 12, 2008 7:03 pm

So, much probably, those various ym2612 chips have different internal register width

good to know, now we need Nemesis to do ALL his tests again :wink:

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