Browse our select late '80s-early '90s mod music collection.
Some of the best are by Jim Young under the names U4ia and F8. We have some of his best U4ia modules (including old U4ia website and mods writeup) and F8 modules.
At the Mod Archive there is a more comprehensive collection of U4ia and F8 tracker modules.
You may also be interested in an old interview with Jim ca. 1996 or Information on Jim's work in Japanese.