JERRY MASON / SCIENCE PHOTO LIBRARY. JERRY MASON / SCIENCE PHOTO LIBRARY.
Operator using light pen to select from the menu display on the screen of a Sirius microcomputer. The menu is the list of options running down the right side of the screen; the one selected is invoked by running the light pen over it. The machine is running a computer-aided design (CAD) program called AUTOCAD which enables architects to use computer graphics to draw up building plans.
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