I presume this is a Yamaha OPL4 chip. As printed on it, it should be General Midi but not GS compatible. I wonder where the sound banks / sample Roms are, but maybe this chip uses some kind of early software synthesis like the later XG models, or it's somehow intergrated, but I'm not very familiar with that.
The host card was quite common, as it was build in in much oem systems. The codec chip is called "Yamaha OPL3-SAx" and thats also the name where you should find the respective dos drivers (part of the win3.1. driver package). It combines good FM sound with some kind of soundblaster compability ( I think SBpro) which is also okay. It's a little bit noisy and loud so you have to experiment with the dos mixer utility the driver comes with. It needs a line in the autoexec.bat to initialize (maybe config.sys too?) but I don't remember if it uses a tsr or not.
If you could make a record of some well known GM game music it would be interesting to hear how it sounds like.
Maybe those links help you:
http://www.yamaha.co.jp/english/product/lsi/d … load/index.html
http://www.opl4.nl/ (upps! This is for msx computers - but maybe it's interesting too?)
http://findarticles.com/p/articles/mi_m0EIN/i … v_6/ai_17547344