Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "Ron Amundson" 
> Also Protel does not have the ability to print white on black, so I 
>have to generate gerber,and then use a gerber tool to create 
>negative transparencies. Does Eagle have that built in?

I'm in a similar boat with my old microsim pcboards/specctra package 
since they were bought out by orcad, then cadence.  You mentioned a 
gerber too to generate negative images; do you know of a free tool 
that will invert a gerber then export it in gerber? --negative plot.  
Some board houses now won't accept innerlayers in positive mode 
anymore and my tools are just old enough they don't do negative 
layers (at least I can't find any way of doing it).