htaccess for Typo (rails) and Wordpress

Hi,

I used to have a blog powered by Wordpress on a free host.

I'd like to use Typo now but I don't want to migrate my old posts so I'd like to keep my old blog under WP in a subdirectory "archive"

http://www.mydomain.com = new blog "Typo"
http://www.mydomain.com/archive = old blog "WP"

The directory structure is
home/mydomain/typo
and
home/mydomain/archive/wordpress

Each taken alone work:

- I managed to install Typo : http://www.mydomain.com point on my Typo blog and works.
(setting up the web directory to http://www.mydomain.com/typo/public in the panel.
I got the standard .htaccess in public)

- I managed to get WP working alone in archive dir (setting up the web directory to http://www.mydomain.com/archive/wordpress in the panel)

But I can't get both running side by side

I would like to put a link in the new blog that point on the old WP blog.

I tried some rewriting rules in .htaccess under typo/public but can't get any make the job !

Does anyone could help ?