Developed in three directions: blind-digitizer based CAD, design automation CAD and auto-interactive CAD. Gerber Scientific introduces RS-274-D as a machine-based format for vector photoplotters.Boards were typically double-sided, with only a small percentage of multilayer boards, usually no more than four layers. Pads were about 70 mils or greater, and traces and spacing were 25 mils.An experienced designer could lay out and tape a board at the rate of about two hours for each equivalent 14-pin IC on the board. A precision camera then produced the 1:1 negative manufacturing film. Boards were designed using 4:1, red-and-blue line vellum method for hand-taping components and tracks.Racal Electronics is founded in the UK.The Institute for Printed Circuits is founded in Chicago.US authorities rule that all electronic circuits for airborne instruments were to be printed.British engineer Arthur Berry patents a print-and-etch method.Paul Eisler (right), “father of the PCB,” is born in Vienna, Austria.Paul Eisler.The concept lays the groundwork for the printed circuit. German inventor Albert Hanson describes a flat foil conductor laminated to an insulating board, using multiple layers.Photosensitive coatings perfected, enabling use of photoengraving and setting the stage for future copper etching processes.
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