A pattern display apparatus in which a pattern is composed of a plurality of rectangular picture elements, picture element signals representing the picture elements are generated from a pattern generator in synchronism with a scanning type display means, and the picture element signals are applied to the scanning type display means thereby to display the pattern thereat comprises means for selectively converting the picture element at a slant portion of the pattern into substantial parallelogram...

A display pattern preparing system for forming picture element series data for formation and display of picture images by raster scanning. "Figure" or "Configuration" of a pattern is disassembled to be normalized. An fixed pattern memory stores, as a registered configuration data, the length of a segment by which a fixed pattern of a prescribed configuration and area crosses a scanning line in the primary direction of scanning. An analogous pattern memory stores, as parameters, a reference posit...

A system for writing cursors on a raster scanned television screen that uses the microprocessor in a display controller to produce blocks of data defining the parameters of vectors that compose the cursor. The blocks are put in a first-in first-out memory during a vertical blanking inerval or during active picture time. Each block specifies where writing of a cursor segment is to start and stop on a horizontal scan line and it also specifies a repeat count that indicates the number of lines on w...

In a raster scan display in which electron beam energization during raster line scan is controlled by comparing a raster value to stored magnitude digital data as a raster line is scanned, a control signal for energizing the electron beam includes a lower bandwidth video signal whereby energization of the electron beam can be anticipated. A comparator of the raster line value to stored magnitude digital data generates a pulse which is applied to three serially connected latches. Logic circuitry ...

The invention relates to a method and device for generating and presenting an image on a visual display unit or some other display member. The image is composed, for example by an operator via a keyboard, of a plurality of symbols defined in advance in a symbol memory, which are placed on the image adjacent to each other. Each symbol is associated with at least one predetermined entry point and at least one predetermined exit point. When creating the image, a symbol is placed so that an entry po...

An area fill technique for graphic images is disclosed wherein the contour lines constituting an image are given in a series of line segments or a series of vectors, and horizontal line segments are ignored. Each line segment other than the horizontal ones is specified by the coordinate addresses for the start and end points in one direction, that is, from top to bottom or from bottom to top. Each is then converted into approximate pixels in the X-Y coordinate system, and stored in a random acce...

A digital computing system is disclosed having a monolithic microprocessor, a versatile input/output subsystem, a multi-medium memory subsystem, and a video display subsystem with audio generating capability. In the memory subsystem, a balanced mix of dynamic RAM, P-channel MOS ROM and N-channel MOS ROM are included to minimize cost without sacrificing performance. In the video display subsystem, a monolithic video display processor performs all RAM access functions, in addition to composite vid...

A circuit and method for displaying characters in a point matrix on a video screen raster with improved resolution utilizes first and second character generators each storing a portion of the character points to be displayed. Each character generator provides an input to an associated shift register, and the shift registers are controlled by complementary clock pulses so that the outputs are shifted by one-half of a bit representing a character point in the matrix. The outputs of the shift regis...

In the field of raster scan computer graphics display equipment, an apparatus for the transformation of picture information specified as line segments defined in terms of a two dimensional planar coordinate system describing the display raster into a form convenient for display on said raster, wherein for each scan line to be displayed the appearance thereof being determined by passing pieces of information describing line segments together composing the picture from a display file memory, sendi...

A method for measuring the density of a vapor includes continuously introducing the vapor into the inlet of a vertical zone at a rate sufficient to maintain the zone completely filled with the vapor, and measuring the pressure at the lower portion of the zone relative to a reference pressure.