Hello Philip.

>  How difficult is it to use a monitor with a microcontroller or
> microprocessor?  As an example i'd like to use a VGA monitor, in
> 320x200, black and white (and eventually color), I couldn't find any
> schematics at all, do I need a CRT controller or can I do it all from
> a micro?

  Well, you have had various answers and most quite correct, even if
they appear to say opposite things.

  It is a good example of asking the wrong question.  It would have been
better asked:  "I wish to implement an xxxx for use in a yyyy with the
following specifications: (... ... ... ...).  How easy is it to use a
microntroller or what pre-built assemblies would do the job cheaply?"

  Cheers,
        Paul B.         (Used to dabble in terminal implementations!)

PS: 320 by 200 is CGA, not VGA  LOTS of used monitors floating about!