Genesis Plus GX

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Post by Relikk Mon 13 Sep 2021 - 14:57

Some more information here from eke about how the MD+ addition works and is detected: https://github.com/ekeeke/Genesis-Plus-GX/issues/297#issuecomment-918468508

Retroplay wrote:Roms need "SEGA MEGASD" header at offset 0x100.

It doesn't appear as though the header edit is necessary. It's the MD+ specific commands detected in the CUE file that are read, as long as the ROM and CUE file are the same name. In saying that, though, I did test out Super SF2 without the header edit and the opening theme started again when it shouldn't and the audio volume was definitely lower when I started a game, compared to how loud/normal it sounded during the intro. Then again that should probably have the SSF2 header, maybe.


Last edited by Relikk on Mon 13 Sep 2021 - 16:38; edited 2 times in total
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Post by Retroplay Mon 13 Sep 2021 - 16:37

Ah, yes, I mis-read that.

It was this that caught my eye first

although no known games are using them, MegaSD extended SSF2 mapper and limited ROM write mapper (automatically enabled when respectively "SEGA SSF2" and "SEGA MEGASD" are found in loaded ROM header) are also emulated, according to the description in MegaSD dev manual . Note that MegaSD overlay will also automatically be enabled when these mappers are detected, no matter of the "CD Add-on" option.

That being said, it really works a treat with this new core update.
Once again, if Eke-Eke should happen to read this, thank you so much for adding support. Smile
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Post by Relikk Mon 13 Sep 2021 - 17:06

Definitely noticing some little bugs with the audio. The volume levels fluctuate, and doesn't seem to be quite at the same level of a MegaSD on real hardware. A little louder than my setup, anyway.

Street Fighter II' Special Champion Edition character select screen, when selecting a character the volume fades out.
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Post by Retroplay Wed 15 Sep 2021 - 12:47

Link in OP updated with latest version.
fixed MegaSD edge case occurring when 'play' command is sent while previous track fade out is still in progress
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Post by Relikk Wed 15 Sep 2021 - 13:07

Nice. It's getting there. Thanks for the build.

There's an issue with loops. Some tracks that are specified to loop, don't loop and vice versa. If a track does loop, the loops are not at all accurate. Again, using SFII' SCE as my test.

And there's the minor issue with volume still. The MegaSD has its default CDDA volume set at 80% and that's what I would use to balance the sound packs. It sounds like the G+GX setting is at 100%. Not at all eke's fault, he probably doesn't know. Maybe a CDDA volume slider like the MegaSD would be useful, or an overall 20% reduction in CDDA volume for that particular portion of the core.
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Post by -pepodmc Wed 15 Sep 2021 - 20:56

Relikk wrote:Nice. It's getting there. Thanks for the build.

There's an issue with loops. Some tracks that are specified to loop, don't loop and vice versa. If a track does loop, the loops are not at all accurate. Again, using SFII' SCE as my test.

And there's the minor issue with volume still. The MegaSD has its default CDDA volume set at 80% and that's what I would use to balance the sound packs. It sounds like the G+GX setting is at 100%. Not at all eke's fault, he probably doesn't know. Maybe a CDDA volume slider like the MegaSD would be useful

Hello.

Did you wrote an issue about this in his github?

-pepodmc
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Post by Retroplay Thu 16 Sep 2021 - 14:04

Yes, something still isn't quite right.

In Darius II/Sagaia, the jingle when you enter options screen keeps looping until you press start and enter level 1.

It behaves correctly when played in MD+ MAME.
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Post by Relikk Fri 17 Sep 2021 - 5:42

-pepodmc wrote:Did you wrote an issue about this in his github?

I have now, as I'm not sure he's monitoring this thread. Although the fade fix suggests he might be, or maybe Retroplay informed him. Anyway...

https://github.com/ekeeke/Genesis-Plus-GX/issues/389
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Post by Retroplay Fri 17 Sep 2021 - 9:17

Yes, latest commit certainly improved things. Smile
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