Here’s the PC88 music from a 1986 Falcom game: Asteka 2. The game was also released on NES and you can find a game log at Slick Productions (search for Tombs and Treasure). A remake was also made for Sega Saturn’s Falcom Classics 2, which contained an audio bonus CD.
The music here is pretty simple and nice and composed by the great Takahito Abe.
This is part of a huge series of Falcom retro PC game rips I found on Japanese P2Ps. I have no way to be sure, but considering some of the material I found, I’d say most of those are actual hardware recordings.