8. The apparatus of claim 7 in which said display means includes means for periodically changing said cursor signal of said second video signal from a first to a second state when said cursor is beyond said horizontal or vertical boundaries.
8. The apparatus of claim 7 in which said display means includes means for periodically changing said cursor signal of said second video signal from a first to a second state when said cursor is beyond said horizontal or vertical boundaries. 9. The apparatus of claim 8 in which said means for periodically changing said cursor signal of said second video signal changes said signal from said first to said second state and back at a rate to generate a blinking cursor.