Some time ago I had a discussion with a friend over old times circuit board design. He referred to where he worked where they used to do manual design using black tape and transparent films. "The layouts were beautiful but difficult or even impossible to modify".?
?
Then "We got a CAD-system from HP" and it all changed.
?
I am unfamiliar with CAD-systems created by and/or sold by HP and what happened to that product.