help with database component

I would like to use the database component to connect to a Interbase
database. Every time I try to connect to the database I receive an error
invalid parameter. Can someone help me what I have to fill in with the
parameters to connect to a Interbase database??

The reason I don't want to use the interbase components is I use a variation
of Delphi. In this variation I can't use all the functions of extra
libraries I would like.

Thanks very much

W. v/d Kruijs