DISPLAY CONTROL SYSTEM

A random refresh vector-generator type display system using a hybrid digital/analog vector generating technique. A digital vector generator decomposes medium length vectors into sub-vectors which are then drawn by an analog vector generator including a delay line. The system utilizes a long vector drawing technique wherein the first portion of a long vector is drawn at a first speed, the middle portion is drawn at a greater speed, and the final portion is drawn at the first speed. A feed forward circuit compensates for the sluggish response of deflection amplifiers of a display monitor so as to more precisely define beginning and end points of vectors. These amplifiers are further compensated by a delta theta circuit which temporarily freezes the system clock to allow the amplifier time to settle so that successive vectors will form sharp corners.