Address generator with variable scan patterns

Abstract From the Canadian patent

An apparatus for reading a first addressable memory and writing into a second addressable memory wherein the first addressable memory is logically arranged in a rectangular matrix and is scanned at an arbitrary angle with respect to the matrix for producing a plurality of scan patterns whose parameters can be altered and controlled by an external source, while the second addressable memory also arranged, in a rectangular matrix is written into along parallel rows, and columns. The apparatus is particularly adapted for use with a digital map display system having an airborne computer for generating the scan parameters.