Apparatus suitable for use with teletext display apparatus which is arranged to operate in a plurality of display modes, including a graphic display mode, in response to digital coded control signals, and to display in each mode digital coded data signals which provide the display information for the viewer. The digital coded control signals are interspersed among the digital coded data signals, with the result that no display information is normally available when a digital coded control signal...

A raster type display apparatus includes interlaced even-and-odd frames. A digital memory of a computer stores line segment data in locations which are sequentially read out to form a line segment display with overlapping line segments. The first line of one field is defined by a "O" start location and a third removed location for the end. The second line is defined by the fourth and seventh locations, and so forth. The first line of the second field starts with the last data taken plus two to a...

A character generator system produces a visual vector display in response to digital vector commands. A plurality of cathode ray beams impinge upon the display screen in a matrix array. The control grid has separate control elements which selectively control the intensity of each of the beams. The deflection system positions the matrix array of cathode ray beams to different locations on the display screen. A segmented binary rate multiplier responds to the digital vector commands to produce int...

This disclosure relates to a system for monitoring and storing the amplitude of a plurality of simultaneously occurring waveforms and simultaneously displaying the history of the waveforms over a predetermined interval of time. The amplitudes of the waveforms are sampled at closely spaced intervals of time and stored in a multi-station memory system. Periodically each stored waveform is updated and the oldest sampled and stored amplitude discarded.

A display system is shown which has a source of coded information in display mapped format and includes plural devices for decoding and utilizing the information in accordance with its position in that mapped format. In the illustrated embodiment, the source includes a refresh buffer and the utilization devices include an attribute decoder and a character generator. A character row counter controls gating which causes the apparatus to treat bytes of data, having attribute format, truly as attrib...

A dot connecting technique for the digital display of a spectrum analyzer generates vertical connecting lines between points by inhibiting the horizontal scan during such generation for a time period proportional to the vertical distance between dots to thereby provide connecting lines of constant intensity.

A graphic display device for shading the region between one straight line L.sub.1 connecting two points P.sub.1 and P.sub.2 and another straight line L.sub.2 parallel to the Y axis or the X axis, including a straight line coordinates generator to define a line L.sub.1 which connects the two points P.sub.1 and P.sub.2, an X or Y coordinates generator to count X or Y coordinates from a point T.sub.t on the line L.sub.1 given by the straight line coordinates generator in a predetermined direction, ...

A central processing unit (CPU) is coupled to a random access memory (RAM) which is organized in correspondence with a cathode ray tube (CRT) type display. The to-be-displayed image is sequentially read from the RAM by a character reader. A reference clock system provides appropriate timing and synchronization signals for CRT scan and memory read out. Means are provided for altering the timing between CRT scan and memory read out in an erratic or psuedo-random manner to produce a scene-shaking e...

The invention concerns a graphics display system of the kind having a refresh raster display device, a line clipping mechanism for clipping line primitives for viewing in a selected rectangular viewport having horizontal and vertical edges parallel to the X and Y axes respectively of the display area of the display device, and a vector-to-raster converter for converting the clipped lines to patterns of discrete pels in a refresh buffer, the vector-to-raster converter including an incremental lin...

A computer system and method of operating the same to setup a graphics display driver and device are disclosed. The disk storage of the computer system contains a monitor file that specifies various video modes operable by a number of monitor types and models, and also contains a mode file that specifies the video modes operable by a number of graphics controllers. The mode file also contains the video parameters for each of the available video modes. During a setup routine, the computer system ...