Abstract: An improved device, of the type utilizing a display having pixels identified by a two-axis coordinate system, displays line segments referenced to the same coordinate system under control of a digital computer. The coordinate system, for example, having standard rectangular X and Y Cartesian coordinates, is configured so that each pixel lies at the intersection of a coordinate line from each of the axes. The improvement has an arrangement for determining as a major axis the axis of the coordinate system with respect to which the line moves most, and for defining the other one of the axes as the minor axis. For each major axis coordinate line crossing of the line segment, a pixel selection arrangement selects for display a pixel that both lies on the major axis coordinate line and has a minor axis coordinate that is closest to the line segment.

Abstract: A system converts an input data stream in a first format (identified by a first stream code having at least two bits) into an output data stream in a second format. The system includes, among other things, a data sequencer for sequencing the input data stream and a counter. The sequencer includes a select input having a first number of selection input locations, a data input for receiving the digital data stream, and output for transmitting the output data stream. The counter includes the first number of selection outputs. A first logic element and a second logic element are coupled to a number of the selection inputs of the sequencer and a number of the selection outputs of the counter. The first and second logic elements control the data sequencer such that the input data stream in converted into the second format.