| 摘要 |
Incremental plotting instructions are received from a computer for bringing about a point-plotting display on a cathode-ray tube. Plotting inputs increment a counter means for accumulating a total representing cathode-ray tube deflection, with the cathode-ray tube being coupled to the counter means via a digital-to-analog converter means. Inputs to the digital-to-analog converter means are positionable relative to the counter stages for changing the scale of the display. Also, a write-through frame is positionable relative to a stored image for selecting a portion of a given display for subsequent presentation. The offset position of the frame is stored in an offset register by means of a digital servomechanism system. A function of the complement of the offset is added to the aforementioned counter means for offsetting a subsequent display. |
