How to boot to text mode?

[Godric]

Apologies for what may be a very simple question - but I'm new using
Debian (migrated from Suse  which I've  had only been using for a while)
but what file do I have to change in Debian 2.1 so that on booting I go
straight to text mode to login rather than the graphical login? I know
in Suse its the /etc/rc.config
Any help appreciated thanks.