Genesis / Megadrive core ported to MiST

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JamesF
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Re: Genesis / Megadrive core ported to MiST

Postby JamesF » Thu Jun 13, 2019 4:12 am

Can someone please test the Sonic & Knuckles audio bug posted above?

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DrOG
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Re: Genesis / Megadrive core ported to MiST

Postby DrOG » Thu Jun 13, 2019 4:15 am

:cheers:

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Re: Genesis / Megadrive core ported to MiST

Postby DanyPPC » Thu Jun 13, 2019 9:19 am

JamesF wrote:Can someone please test the Sonic & Knuckles audio bug posted above?


I have tested it on my MiST, I confirm the distortion even on MiST.

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Re: Genesis / Megadrive core ported to MiST

Postby JamesF » Thu Jun 13, 2019 10:16 am

Thank you very much for testing.
That means there is a bug in JT12 (YM2612) emulation by jotego.

Can you please test this:
https://github.com/MiSTer-devel/Genesis ... /issues/54

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Re: Genesis / Megadrive core ported to MiST

Postby slingshot » Thu Jun 13, 2019 11:10 am

JamesF wrote:Thank you very much for testing.
That means there is a bug in JT12 (YM2612) emulation by jotego.

Can you please test this:
https://github.com/MiSTer-devel/Genesis ... /issues/54


Did you try it without the sound mixer (jt12_genmix)?

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Re: Genesis / Megadrive core ported to MiST

Postby JamesF » Thu Jun 13, 2019 12:30 pm

No yet.
Can I compile without the mixer to test?
If so, what line should I remove/modify here?
https://github.com/MiSTer-devel/Genesis ... m.sv#L1239

I've compiled cores using Quartus many times.

The Genesis core (final mix?) is just way too loud compared to other cores.

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Re: Genesis / Megadrive core ported to MiST

Postby slingshot » Thu Jun 13, 2019 1:24 pm

JamesF wrote:No yet.
Can I compile without the mixer to test?
If so, what line should I remove/modify here?
https://github.com/MiSTer-devel/Genesis ... m.sv#L1239

I've compiled cores using Quartus many times.

The Genesis core (final mix?) is just way too loud compared to other cores.

I think you can just bypass the mixer (with the LP filters):

Code: Select all

DAC_RDATA <= FM_RIGHT;
DAC_LDATA <= FM_LEFT;

and comment out fm_lpf_xx, genmix and lpf_xxx sections.
It'll also disable the PSG, too, but for testing only the FM, it's even better.

If need for a signed/unsigned conversion, then it's a bit different.

I remember, it was a common complaint last year that the FM sound is too silent :)

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Re: Genesis / Megadrive core ported to MiST

Postby DanyPPC » Thu Jun 13, 2019 4:11 pm

JamesF wrote:Thank you very much for testing.
That means there is a bug in JT12 (YM2612) emulation by jotego.

Can you please test this:
https://github.com/MiSTer-devel/Genesis ... /issues/54


Confirm distortion on MiST too.

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vebxenon
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Re: Genesis / Megadrive core ported to MiST

Postby vebxenon » Mon Jun 24, 2019 4:57 pm

Just a computer and videogame lover :)

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Re: Genesis / Megadrive core ported to MiST

Postby DanyPPC » Tue Jun 25, 2019 8:48 am

Now this core is absolutely perfect !

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Re: Genesis / Megadrive core ported to MiST

Postby Televicious » Wed Jul 17, 2019 5:08 am

Just tried out street fighter 2 new champions and that's more broken than it was before. graphics are severely glitched. Used to just be the sound.

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Re: Genesis / Megadrive core ported to MiST

Postby DanyPPC » Wed Jul 17, 2019 6:58 am

Don't use SVP version for all games.

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Re: Genesis / Megadrive core ported to MiST

Postby vebxenon » Sat Aug 17, 2019 7:15 am

Just a computer and videogame lover :)

- Atari Jr 2600 clone
- Atari 7800 Peritel
- Atari XEGS
- Atari Lynx II
- Atari Jaguar
- MiST Board


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