Hello, I have seen some vintage PCBs (60's-80's) that have completely round corners in their copper tracks layout.
How did they do it? did they use some kind of CAD software back then or just paint it by hand?
Any such CAD software available forgotten somewhere?
The IC CAD software I use, will draw donuts which
you can then chop to make whatever angle of bend
you like. The path function is all ortho though. And
everything conic gets converted to 20-side polygons
in the end.