Upgrade in the wrong way

Hi,

As a newbie to Postgres, I made a complete backup of my databases on a
cdrom when I left my previous office. I did not use pg_dump. I was
runing Version 6.5.3.

I am now on a computer running Postgresql7.0

Of course I am in trouble.

Is there anyway to dump my old base to recover it in the 7.0 version
without installing the 6.5 complete version ?

Thanks for any help

L. Tito de Morais
ltito(at)voila(dot)fr