Abstract: An accumulating arithmetic memory (AAM) integrated circuit or AAM chip that includes a set of accumulators or registers. Once an accumulator is selected, e.g., by using a look up table, a multiplexer retrieves the data from the selected accumulator. Then, as input data is presented to the AAM chip, an adder adds, subtracts or multiplies the input data with the data retrieved from the selected accumulator. The resulting output is returned to the originally selected accumulator. The multiplexer can also substitute a zero for the data retrieved from each accumulator and an internal address counter is used to read out the contents of all accumulators.

Abstract: A stroke writing character generator pauses between the generation of vectors, which may meet at sharp corners, so as to reduce deflection bandwidth. A stroke state machine having a plurality of states controls the generation of the vectors. The plurality of states includes a time pause state. A vector length counter provides an end of vector signal that causes the stroke state machine to enter the time pause state for inserting a time pause between the generation of the vectors. The video of the CRT on which the vectors are written is blanked in coincidence with the time pause.

Abstract: Stroke display apparatus generates symbols or characters on a display screen and permits dynamic rotation or translation of those characters without placing a computation burden on the host processor. The characters are represented as a series of connected line segments, or blank segments, each having a characteristic direction or vector angle. Each of the line segments are generated by successively adding incremental .DELTA.x and .DELTA.y steps to an x,y position until the desired length is achieved. The character is rotated by adding a predetermined offset angle to each characteristic vector angle and then by converting the rotated vector angle into incremental .DELTA.x and .DELTA.y steps. Character translation is accomplished by including an extra, typically blanked, line segment command before the character is drawn.

Abstract: An artificial horizon display generator determines either sky shading or ground shading in real time as each pixel of a raster display is generated. Transition line parameters are specified by host processor, whereupon the display generator computes whether the raster line currently being generated will intersect the horizon boundary line, and if so, at what X-Y transition point. Pixels generated prior to the transition point are of the initial shading; pixels generated subsequent to the transition point are of the opposite shading.