Everything I've posted in this thread is an OPL2 (YM3812) composition/arrangement. For the recordings, however, I've captured the S/PDIF output from an OPL3-based AWE32.
Sorry for raising this from the dead, but could I please ask how you recorded this in more detail? As you say, the Genpei War music is very impressive. It almost sounds like there's stereo and reverb going on there somehow, despite the OPL2 being mono (as far as I know).
1. Where did you manage to find the original game (Genpei War)?
2. Did you record it by simply running the game and recording from S/PDIF out?
3. What are the specs of the machine you ran it on?
4. Any extra effects or processing applied?