As I said on your other post, it looks like an 800 TRI.
Here's a 90's catalogue picture page. The Cats Wiskas featured used to belong to me and now belongs to another forum member, unfortunately it lost its paint job a long time ago and is now silver.
Here is a 1996 catalogue, probably the last produced before Dave stopped frame building. I own the Quantum 650 frame in this catalogue, I also own a Cats Wiskas with very similar geometry, which is very different to the 1990 model.