A counter determines when all DE groups of a word have been displayed in each of the gray shade modes, and resets all of the DVDS, thereby shutting off display after one, two or three DMS memory cycles in the eight, four and two gray shade modes, respectively, until the next word is automatically read out of memory as a separate counter in the DVDS keeps track of the DMS-memory cycles for the different gray shade modes. As each DE group is read, an X-axis integrator is incremented by one, two or four units depending upon the X-axis mode selected. A cathode-ray tube (CRT) is a specialized vacuum tube in which images are produced when an electron beam strikes a phosphorescent surface. DE groups are transmitted to the CRT intensity control through a static digital level select network. A cathode-ray tube is a central technology used in a device called a Cathode Ray Oscilloscope which is the scientific name of the type of television your parents or grandparents used to watch.
Each word thereafter contains a predeter mined number n of bits for n/3, n/2 or nil display elements (DE) in the respective eight, four and two gray shade modes. The first word of raster data designates the Y-axis value to be transmitted to the CRT vertical deflection system through a static digital-to analog converter. The cathode ray tube (CRT) is a vacuum tube containing an electron gun (a source of electrons) and a fluorescent screen, with internal or external means to. At the end of each raster, the DMS interrupts the computer for a new starting lo cation of a raster of data to follow the next while a DVDS con trol subsystem is prepared for the next raster.
The DVDS includes a central processing unit for ac tivating the system, selecting the X (horizontal axis) and Z (in tensity modulation) modes, and designating the starting loca tion of two successive rasters of data from a memory accessed by a data multiplexer subsystem (DMS). A digital video display system (DWDS) is disclosed for display of image, alphanumeric and other data on a cathode-ray tube (CRT) with sequential raster scan and two, four or eight gray shades.
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