> I'd be very interested in seeing the datasheet for this chip > as well, as I Sorry, i don't have infos on the YM2164, but on the following ones : YMF289 YMF278 YMU277 YM2149 YM3439 YMZ284 YMF262 YMU251 YM2413 YM2203 YM3812 YM2151 Y8950.