Control means to provide slow scrolling positioning and spacing in a digital video display system

In a digital video display system having a video monitor and a character generator, said video monitor being operated in a raster scan mode whereby a plurality of lines of characters are sequentially displayed during a complete scan period of said video monitor, said character generator including a font storage and control element, said control element comprising:

• an initial position register counter coupled to said font storage, said counter being adapted to receive a parameter code specifying the initial raster scan location of the initial scan line of a character line to be display and to increment to subsequent scan lines of said character line, each character line being formed of a plurality of scan lines, each scan line being formed by a row of picture elements;
• parameter code supplying means coupled to said register counter to supply a different parameter code for each new character line to be displayed so as to cause a character to be displayed starting at a different scan line of a particular character line during the next display of that character line:
• and
• timing means coupled to said counter and to said parameter code supplying means to generate timing signals representing picture elements to be displayed by said video monitor, said picture elements forming the respective scan lines that display various characters and other symbols.