Embarrasing newbie question perhaps, I create a viewport and select 1:1, but the contents when scaled in that window are not 1:1.  I am using acad2000.I'm thinking that somewhere there is another scale factor specified, operating in between the model and paper space. When I select 1:30, the items print slightly small, I think if I could specify a print scale of 1:24.5 they  might be perfect.What am I missing?

I now think its a scale setting in the plotter drive - as I changed to a different driver and now get correct print scales in the drawing. Wierd.