A video generator is disclosed for use in a digital television display system, for converting randomly occurring data signals representing graphical patterns into a time-sequential video signal for use with a sequentially line scanned display device. The circuit is comprised of a threaded buffer connected to receive the data signals and adapted to sort the data signals into groups ordered by extremal scan line positions for the pattern represented. An intermediate buffer has a first input connec...

The system includes at least two character generators, one for U.S. alphanumeric symbols, and the other for systems which use a majority of U.S. symbols, but each of which has a group of unique characters, also. A logic circuit steers the incoming data signals to one character generator or the other.

Dot matrix characters are rounded by interpolating quarter dots in the angles of diagonal strokes with the feature that the video signal is a line interlaced signal; the diagonals are detected as predetermined logical combinations of an undelayed signal, a dot-delayed signal, a line delayed signal and a line-plus-dot delayed signal; the quarter dots are interpolated in real time as the diagonals are detected but are interpolated in a first one of the said signals in first fields and in a second ...

A graphic display device of the type which receives instructions from an external computer and, by successively scanning the rasters of a display matrix, displays patterns such as alphanumeric characters, symbols, etc. upon a cathode ray tube. The graphic display device has a pattern generator which stores patterns in raster form and generates signals for forming such patterns upon receipt of a pattern address signal designating the particular pattern to be formed, and a repeating raster designa...

A multi-channel display apparatus includes a computer having a random access memory means for storing of the continuous monitored data and for driving of a multiple-channel television unit, with each channel identified by a preselected unique color. Vertical scan lines generate line display segments in each channel. The computer stores line segment definition information which is compared with a beam driver control to activate one color driver which is preset to produce a predetermined color pre...

A graphic display device of the type which receives data and instructions from an external computer and displays graphic patterns such as alphanumeric characters, symbols, etc., upon a cathode ray tube in accordance therewith. The graphic display device has a pattern generator for storing luminance data controlling the formation on the cathode ray tube of predetermined patterns, and a refresh memory for receiving and storing data designating the particular arrangement of patterns to be displayed...

In a cathode ray tube display system, characters are generated for display either as matrices of dots or as sets of strokes on the lines of a parallel horizontal line raster.

The specification shows and describes a visual display of the CRT variety wherein column separator lines may be displayed intermediate character matrix positions as an operator aid. The visual column separators further do not require that any character position be used or encroached upon and where limited spacing occurs between character forming dot matrices, logic delays may be utilized in the video modify circuitry to displace the separator line and thereby visually distinguish such separator ...

Memory system having contiguous storage locations with sequential addresses is partitioned into units to permit separate unit write-in and parallel unit read-out, operations. Each unit is responsive to common word address signals and unique combinations of block address signals. In response to a control signal in a first of two possible states, the memory system operates in a conventional manner, i.e., data is read from or written to a particular location in the memory to or from a data bus, the...

A roll-up method for a display unit according to this invention consists of supplying data for designating a roll-up region to a roll-up address counter to designate an address for a refresh memory storing a character display data portion and a control data portion and modifying the contents of said address counter to modify the stored information of said refresh memory in a fly-back time of the display unit by means of a roll-up instruction, thereby rolling up said region.