Genesis / Megadrive core ported to MiST

[JamesF]

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

[DrOG]

[DanyPPC]

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.

[JamesF]

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

[slingshot]

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)?

[JamesF]

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.

[slingshot]

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

[DanyPPC]

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.

[vebxenon]

New SVP release https://github.com/mist-devel/mist-bina ... 190623.rbf

[DanyPPC]

Now this core is absolutely perfect !

[Televicious]

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.

[DanyPPC]

Don't use SVP version for all games.

[vebxenon]

New updates

https://github.com/mist-devel/mist-bina ... es/fpgagen

[seastalker]

Is there an updated list of changes? Also, will the two different versions (main and Virtua Racing)of the core someday get merged after more testing is done? What work/testing can we do to help merge the two if so?

[slingshot]

You can browse the source repo, the changes are mostly internal VDP things, like correcting the FIFO size and such. Some visible improvements are in Landstalker, and the fully stabilized Direct Color DMA demos.
I don't plan to have one core with both SVP and non-SVP, the SVP chip fills up the FPGA fully and it's a PITA to work on the core while it's enabled. Also would need some cart auto-detection to enable/disable the SVP (OSD option would ugly).

[Chris23235]

The new Megadrive/Genesis game Xeonocrisis works fine on the Genesis core and it looks beautiful.

[DanyPPC]

New release:
https://github.com/mist-devel/mist-bina ... es/fpgagen

[alexh]

Thanks for all the hard work.

Out of curiosity what is "Horizontal border opening support - Titan II Arcade scene"?

Is that the VDP V28/V30 bit trick used in the demo "Overdrive II by Titan" ?

[slingshot]

Thanks for all the hard work.

Out of curiosity what is "Horizontal border opening support - Titan II Arcade scene"?

Is that the VDP V28/V30 bit trick used in the demo "Overdrive 2 by Titan" ?

No, upper/lower border opening is supported since about April.
It's about drawing into the left and right border area.
https://youtu.be/gWVmPtr9O0g?t=256

[vebxenon]

New release:
https://github.com/mist-devel/mist-bina ... es/fpgagen

[MasterOfGizmo]

Unbelievable. Slingshot you always amaze me ...

Just for historic reasons: This was when be all thought the genesis core would probably not get any better:
http://retroramblings.net/?p=1201

How wrong we were

[slingshot]

I was fascinated by these diagrams from Nemesis when I first saw them:
https://gendev.spritesmind.net/forum/vi ... 851#p12323
Finally this cycle pattern is fully implemented

The wiki page stil lists FPGAGEN as:
https://github.com/mist-devel/mist-boar ... 20Projects
"Uses all three memory chips of the DE board, hard to port to the single SDRAM of the MiST"

[Lroby74]

The wiki page stil lists FPGAGEN as:
https://github.com/mist-devel/mist-boar ... 20Projects
"Uses all three memory chips of the DE board, hard to port to the single SDRAM of the MiST"

This files seems to be quite old, 2012 if i am not wrong..

[MasterOfGizmo]

"Uses all three memory chips of the DE board, hard to port to the single SDRAM of the MiST"

Fixed, thanks for reporting this.

[Lroby74]

Fixed, thanks for reporting this.

Sorry but has been Slingshot to report this, not me, i just did a wrong quote