The thing i would ask - does the rom set match the version of FB Alpha you have?
Just curious, why don't use FB Neo instead? It adds some nice features like rewind and fixes a lot of bugs, for example with Mortal Kombat and other midway games - they only run at 30fps in FB Alpha.... Also the current FBNeo fullset is easy to get (hint, google fbneo archive.org)
best regards,
- dink