cmccaff1 wrote:
Honestly, at this point, I don't know if we are ever going to have accurate YMF271 emulation without assistance from at least one of the people who originally designed that chip over 25 years ago, or a composer who had a fair amount of experience working with it back then. It is a testament to how advanced it was for its era that in 2021, emulation of it is still nowhere near 100%.
I don't know how many people have reached out to Yamaha over the years about getting more info on the YMF271 and I'm not sure where to begin as far as requesting a datasheet. The fact that one does not seem to have turned up on the Internet after all this time either indicates that one does not exist (and I strongly doubt that's the case), or that Yamaha is very protective of anything involving this chip (though I would imagine that by this point they should have little to no problem with the info becoming public knowledge, as the chip has long fallen out of mainstream use [and was never that popular or ubiquitous to begin with even in its time]).
As the MAME emulation has regressed, perhaps it may be helpful to identify the final version before the regressions were introduced, and encourage rippers to use that one for any future YMF271 rips (or perhaps even redo existing rips with it, assuming there were no major improvements from the MAME versions used for those rips to the final version without the regressions). I totally understand if the rips are pulled from the site completely and support for the YMF271 is dropped for the moment. This is just an idea so that it hopefully doesn't have to come to that. As always, I appreciate your efforts and those of everyone else...I listen to music on VGMRips.net every day, and couldn't imagine going a day without this site.
I have a Japanese version of the complete YMF271 data sheet here.
https://drive.google.com/file/d/1tb9oER ... sp=sharing