초록

A circuit and method for receiving and sequentially decrementing the x and y coordinates of a desired cursor location so as to produce in a raster-scan display system a cross-hair cursor the component parts of which extend the full height and width of the display area.

대표청구항 ▼

A circuit for producing a full-screen cross-hair cursor in a display system including a display screen and means for producing a raster-scan image thereon, said circuit comprising: (a) positional means for producing first and second digital signals representative respectively of first and second coo

A circuit for producing a full-screen cross-hair cursor in a display system including a display screen and means for producing a raster-scan image thereon, said circuit comprising: (a) positional means for producing first and second digital signals representative respectively of first and second coordinate values of a desired location on said screen of a cursor to be produced; (b) first counter means for receiving and selectively decrementing said first digital signal and for producing a first indication when said signal has been decremented to zero; (c) second counter means for receiving and selectively decrementing said second signal and for producing a second indication when said signal has been decremented to zero; and (d) means responsive to said first and second indications for producing an illuminated spot on the screen of said display system whenever either, but not both, of said digital signals have been decremented to zero.