jmarsh,
- the DOSBox-X team has integrated and tested your DMA status register fix: https://github.com/joncampbell123/dosbox-x/issues/1961, and I suspect it will appear in their next release.
- it's been further integrated into DOSBox Staging, https://github.com/dosbox-staging/dosbox-staging/pull/685 with yourself credited as the original author in the commit.

After seeing the documentation that Jon Cambell references, it's indeed a correction and improvement. Thank you.

So I guess this emulation improvment isn't in DOSBox SVN ?

Ähm, reread the initial question by Kcroft...

Oh, good.

What about Nuked OPL ?

Nuked OPL is another implementation of the OPL implementation that some people think is superior to other implementations. What else do you need to know about it?

Many thanks to jmarsh, Jon Cambell and krcroft for the joint improvement efforts to the GUS implementation.

Dominus wrote on 2020-10-25, 21:24:

Nuked OPL is another implementation of the OPL implementation that some people think is superior to other implementations. What else do you need to know about it?

All other forks added it as an option, and to me and others it is clearly superior. I compared to real hardware, and it's noticeably more faithful. Why isn't it in SVN ?
Any reason would be fine, but I did not find anything.

It's on the table to be checked to be added.
Do you have any games in which this opl core is superior to the others ? (so I can compare it myself)

Lands of Lore comes to mind, especially the forest part (beginning of the game) compared to a real SB16.

Edit:
Also, Cryo's Dune with Adlib music is clearly better with Nuked OPL enabled.
After all, this games contains specific drivers and uses undocumented features, or so the story goes anyway.

xcomcmdr wrote on 2020-10-26, 07:48:

After all, this games contains specific drivers and uses undocumented features, or so the story goes anyway.

Unless it uses the "composite sine wave mode", which afaik nobody has ever documented (not even Yamaha themselves), I don't think there are "undocumented features" in the OPL2.

JAL

Some more info here :
http://www.vgmpf.com/Wiki/index.php/HERAD

But that's beside the point, anyway.

xcomcmdr wrote on 2020-10-26, 09:05:

Some more info here : http://www.vgmpf.com/Wiki/index.php/HERAD

Ad Lib Inc., in its Programmer's Manual, shows the full register map of the OPL2, as far as I can see. So this may perhaps be a misinterpretation or a misremembering of that person.

But that's beside the point, anyway.

Agreed that it's besides the point. Dosbox should not strive to be "good enough" to play games, it should run the games as good as possible. If that means better OPL2 emulation, then I'd go for it.

JAL