Using a graphic data-processing system to design artwork for manufacturing hybrid integrated circuits

This paper will describe a computer program that utilizes a graphic data processing system to aid in the design of mask artwork for hybrid integrated circuit modules of the type used in IBM System/360 Data Processing Systems. The system includes a small digital computer connected to a large-screen buffered display equipped with a light pen. A draftsman uses the light pen to assemble a circuit schematic on the display screen; simultaneously, a description of the schematic is entered into the computer memory. Thereafter, the draftsman can use the light pen to layout detailed artwork for fabrication of the circuit mask, subject to automatic checking against the stored schematic. When the layout on the display screen is complete, the corresponding mask artwork will be drawn by the computer via its digitally-controlled plotter. The graphical manipulations on the display screen, the automatic checking operations, and the control of the digital plotter are all part of a FORTRAN program that employs graphical subroutines to communicate with the light pen, display, and plotter.