Emacs word wrap at a specific column number

I like to run my editor full-screen. The only thing is, though, that when I do this, the word wrap only kicks in when the line hits the right edge of the screen. I would like it to do so, already when the line hits, say, column number 200.

How do I do that?

I would like it to happen in all modes, e.g., Org-mode. I added the line (global-visual-line-mode t) to my .emacs file, in order for the word wrapping also to work in org-mode.

I'm running Emacs 23.

I got it working! Here is what I added to my .emacs file to make it happen:

(add-hook 'text-mode-hook 'turn-on-auto-fill)
(add-hook 'text-mode-hook
  '(lambda() (set-fill-column 80)))