Abstract: A three-dimensional, texture mapping display system for displaying three-dimensional projected polygons with texture map on a two-dimensional raster display screen includes a host processor and a graphics co-processor. The host processor is responsive to input data from a host memory defining an overall image that is to be displayed on a three-dimensional form on a raster display device for generating command signals, screen coordinates on the display device, and corresponding texture space coordinates on a texture memory. The graphics co-processor is responsive to the command signals, screen coordinates, and corresponding screen space coordinates for determining destination addresses for each pixel on the screen space of the display device and for determining a corresponding source address applying surface texture data to the image for each destination address.

Abstract: A variable position flipper mechanism is disclosed for use with pinball or rolling ball games. The flippers, actuated by solenoid mechanisms, are spaced a selectable distance apart thereby to permit adjustment in the skill level of the game. Spacing of the flipper mechanisms is accomplished by rotating a cam plate which is ratcheted into various positions by a pair of solenoid operators and appropriate linkages. Rotation of the cam plate in a first direction spaces the flippers at their maximum distance, while rotation in the opposite direction moves the flippers to successively closer positions. Optical detection means can be associated with the cam plate to provide position information to a controller associated with the pinall machine.