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Abstract

A cursive writing type cathode ray tube (CRT) display system in which the vertical size of the characters are increased by an input command from a keyboard and central processing unit (CPU). The CRT has both electrostatic and magnetic deflection systems with the magnetic deflection producing a raster in which each horizontal scan is electrostatically deflected to write characters on the screen. The characters are formed from stored digital codes selected by commands from the CPU. Digital to analog (D/A) converters produce analog deflection signals to produce a set of multiple strokes to form a character and to produce analog voltages for controlling the brightness of the stroke. Digital commands from the CPU are generated to increase or decrease the magnitudes of the various analog signals from the D/A converters when changing the vertical character size. Full page or partial page displays may be produced in which the number of horizontal scan lines for the partial page display is reduced over that for the full page display and the vertical character heights are proportionately increased. The system also may provide either 10 or 12 pitch characters on command from the CPU as well as superscripts and subscripts.

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First Claim