Does anyone know where I can find information about Miyatas? Basically, I am looking for information about models and years, the specs, geometry, components, etc.

The reason I am looking for this info is that I saw an ad for a 1990 Miyata 310. The ad said the bike was an aluminum frame. I would like to know if this is accurate or if it is a steel frame and if steel, what kind. I would also like to know what is on it.