old JDBC driver (8.1-JDBC3) can connect to postgresql 9.x ?

Hi exports,

Thanks for your great effort and works for JDBC drivers.
Now I have one question.

  (Q) Can the old JDBC driver(8.1-404 JDBC3) connect to latest or supported versions(greater than 9.1) of postgresql ??

We would be happy if we have an answerfor this because of the background below although it's not supported version
currently...
I hope that postgresql 9.x can handle V3 JDBC protocols even if a versions of jdbc3 driver on clients is old.

  Background:
    - Our old web application is running on JVM 1.5 + tomcat5 + JDBC driver(8.1-404-JDBC3) + postgresql 8.3.22
    - Now we plan to get to connect the application to postgresql 9.x(setup newly) in addition to the existing
postgresql8.3.22. 

Thanks and best regards,
itoshun

efeel web administrater