OPL3(Yamaha YMF-262) control emulation is defective \ VOGONS

OPL3(Yamaha YMF-262) control emulation is defective

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First post, by wiebermensch

Posted on 2004-03-08, 02:41

wiebermensch Offline

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I got some information about DOS/V games.
DOS/V games use PLAY5V.COM, which controls OPL3 chip(Sound Blaster 16) directly.
OPL3 chip was not so generally used, so getting source codes and
samples is not easy 🙁
But you can analyze PLAY5V.COM if you are persevering.

My Question : How well does DOSBox can emulate OPL3 sound?
When I played Nanpa2, I could hear every sounds and BGMs, but
some sounds(especially chordal sounds and drum sounds) was so jerky.

Reply 1 of 6, by Stiletto

Posted on 2004-03-08, 08:18

Stiletto Offline

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DOSBox (now) uses the OPL3 emulation from MAME, which was reverse-engineered from the chip itself as well as from official Yamaha datasheets and programming manuals. If anything is truly wrong with it, let me know. I try to be (when I have the time) the official contact between the VDMSound/DOSBox projects and the author of the OPL2/OPL3 emulation, Jarek Burczynski.

"I see a little silhouette-o of a man, Scaramouche, Scaramouche, will you
do the Fandango!" - Queen

Stiletto

Reply 2 of 6, by Stiletto

Posted on 2004-03-08, 08:20

Stiletto Offline

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To clarify: please be certain that this choppiness is not due to the slowness of your computer. If a DOSBox developer can verify that this is happening, that would be useful.

"I see a little silhouette-o of a man, Scaramouche, Scaramouche, will you
do the Fandango!" - Queen

Stiletto

Reply 3 of 6, by Harekiet

Posted on 2004-03-08, 08:31

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dosbox only had opl3 emulation after the 0.61 release, so if your testing with 0.61 all your getting is opl2.

Reply 4 of 6, by wiebermensch

Posted on 2004-03-08, 11:58

wiebermensch Offline

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Harekiet, thank you. I downloaded and executed it just a minute ago,
and I could hear great sound.

Reply 5 of 6, by Srecko

Posted on 2004-03-08, 13:24

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Falcon 3: engine 'sound' is cut out in game. With any opl setting. Didn't have that problem before.
Btw. sky color is wrong in this game 😖

Reply 6 of 6, by taiken7

Posted on 2004-03-09, 07:52

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The new OPL3 "fixes" Lemmings 2 .. in the sense that sound effects no longer play; but there are no graphics glitches either. (I'm sure its
something to do with an Adlib block of memory being allocated at runtime..)

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