vgmrips

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PostPosted: 2013-03-07, 15:42:06 

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OK, posted on dmpsoft's BBS.


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PostPosted: 2015-10-10, 18:14:06 

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When converting an S98 to VGM, the first FM note does not play. Why is this? Or am I just not converting it properly? Or is my VGM player not playing it correctly? :bash:

I have attached the original S98 file and the VGM file for reference.


Attachments:
manji_07.S98 [271.9 KiB]
Downloaded 31 times
manji_07.vgm [286.44 KiB]
Downloaded 32 times

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I'm HarmoDevil. Formerly Dr Devil, but I still use the drdevil username here.

Check out my Soundcloud.

I might get back to VGM ripping someday.
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PostPosted: 2015-10-11, 2:20:59 

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Joined: 2011-12-28, 19:52:40
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Did you record it yourself, or is it an existing S98 rip? I've found that many old S98 files don't convert properly to VGM, even with the Japanese tool S98v1tov3 (S982VGM only supports v3 version, if I'm not mistaken).

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Sega PCM [1985/1989] | Namco C140 [1987/1990] | Hudson HuC6280 [1987/1995] | Yamaha YM2608 [1988/1996] | Oki MSM6295 [1988/1998]


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PostPosted: 2015-10-11, 9:04:25 

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It was an existing rip.

Hopefully, in the future, someone will modify the program so that old .s98 files will convert to .vgm properly. :(

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I'm HarmoDevil. Formerly Dr Devil, but I still use the drdevil username here.

Check out my Soundcloud.

I might get back to VGM ripping someday.


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PostPosted: 2015-10-11, 11:12:04 

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Joined: 2011-12-01, 20:20:07
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There are two things that can cause oddities:
  1. The YM2608 can run in YM2203 mode and does this by default (like the OPL2 fallback on OPL3). S98 files seem to lack the YM2608 enable command pretty often. (56 29 80 in VGMs)
    I'm pretty sure this is the issue, btw. You can fix this by hex-editing the VGM. (I think just overwriting the first command should work.)
  2. The VGM you posted has LOTS of commands at sample 0. This might be due to the way the S98 was trimmed. MAME's sound emulators sometimes don't like that. (I didn't see any KeyOn command before the loop point though. Those cause the most problems, so it should work.)
From what I could see in a vgm2txt, the song doesn't seem to use the extra YM2608 channel at all, except that it sends a few KeyOff commands to those channels. (VGM file offset 0x55D to 0x572) I assume that if you would remove those, you could as well make a YM2203 VGM.


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PostPosted: 2015-10-11, 17:33:15 

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Sounds like good ideas to me. Unfortunately, I'm not very good at hacking so it will take a long time before I fully understand the ideas. :lol:

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I'm HarmoDevil. Formerly Dr Devil, but I still use the drdevil username here.

Check out my Soundcloud.

I might get back to VGM ripping someday.


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