One more comment on the use of blowouts (voids) on inner planes. Protel, in 
company with nearly all CAD systems, does *not* DRC these planes beyond 
certain simple tests. You must manually be *certain* that Protel does not 
think that any connections are being made in the voided areas of a plane, 
for your blowouts -- manually placed or calculated by the software from 
your design rules -- may remove the copper for those connections. This is 
true even *without* additional blowout primitives manually placed, if the 
plane expansion rules are such that expansions from adjacent pads overlap.

An error here will only *remove* connectivity, it will not add it, so a bad 
board from this will be relatively easy to patch, whereas a short on an 
inner plane is a nuisance and three-quarters. As far as I know, your DRC 
should guarantee that there are no shorts, unless you have a connecting pad 
on a split plane boundary, about which DRC warns. This *might* cause a 
problem. Inspect the photoplots for inner planes carefully!
[EMAIL PROTECTED]
Abdulrahman Lomax
Easthampton, Massachusetts USA

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