A guy giving a presentation to us was looking at various motherboards and making assesments like "this is a 4 layer board", "that one is 6 layers". Can someone actually differentiate with an average eye, between boards with 4 layers and 6 layers? Thickness of boards can vary a bit even in-between runs so what's the technique here? Jim -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist