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ASCII design files
asymetrical components ( a 1000pin comp can be splitted into 10 100pin symbols) will work very well (they're not supported with the symbol creator, but a good text editor will help more than the symbol creator...)
OrCAD.. tried to use it... but the UI was very strange and the binary compiled library and schematics are unable to put our own tools in top of this tool.
Orcad in PSD 14XXX very easy to use, If U want to built a component with 1000 pins or more, it's ok. but notice that, when built symbol in Orcad, Pin name have different, not the same name, after that U can export to Allegro netlist, everything is very nice.