> How are non-plated though holes specified in gerber files?  I'm using 
> Eagle,
> btw, and I notice that on locations with a hole (rather than a pad) some
> board houses thru-plate them and others don't.
>
> Is there a formal spec/definition for this in the gerber file?  (This 
> would be
> preferred over putting notes in the readme, as I've been noticing that 
> most
> board-houses don't pay attention to the readme files.)

Orcad produces two drill files, one for plated holes, one for non-plated. It 
also has a tick box that combines them at file production time, so you get 
only one file, which is what people like Olimex require for their cheap 
boards, and then you get the plated through hole with no pads on top and 
bottom.

The files are the normal CNC toll/position instruction files, which is a 
text file. 

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