Digital raster display generator for moving displays

A digital raster display system having a display face comprising

• raster generating means for generating a raster on said display face, said raster generating means including digital timing circuit means for providing digital signals synchronous with respect to said raster,
• first random access programmable memory means responsive to said digital signals and having a plurality of storage locations corresponding to a respective plurality of display cells comprising said display face,
• said digital signals addressing said storage location corresponding to said display cell associated with the point of said raster being generated,
• each storage location containing a symbol defining word comprising a symbol address portion,
• said first memory means providing a symbol address signal corresponding to said symbol address portion of said symbol defining word stored at said storage location addressed by said digital signals,
• second random access programmable memory means responsive to said symbol address signal and having a plurality of symbol storage means for storing a respective plurality of symbols and patterns to be displayed in said display cells, said plurality of symbol storage means being addressed by said symbol address signal for providing symbol display signals in accordance with said symbol or pattern stored in said addressed symbol storage means,
• display means responsive to said symbol display signals for displaying said symbol or pattern stored in said addressed symbol storage means in said display cell associated with said point of said raster being generated, and
• means for periodically updating the data stored in said second random access programmable memory means,
• whereby motion is readily imparted to said displayed symbol or pattern.