One of the permissable formats of the *.PEN file that must accompany any Gerber RS427D file appears to be text with each line formatted as...
<Vertical>, <Horizontal>, <Type>, <Tool> [,<Drill>] where <Tool> is any of L = Line R = Rectangle C = Circle O = Oval E.g... 0.012, 0.012, L, D112 The file must have the same name as the *.GBR file, and be placed in the same directory that the *.GBR file is loaded from. Jim PS: I could not find any documentation on this, but module "dcode.cpp" provided lots of clues.
