Abstract: Method and apparatus for interconnecting parallel command data in a controller and parallel status data in a controlled device by transmitting the command and status data between the controller and controlled device through serial data links. The serial data links to and from the controller pass through electromagnetic radiation filters to prevent any radiation from leaving the controller through the interconnecting command and status data lines.

Abstract: Interface circuitry for effectuating the control of a printing unit that employs a cursor moving in a scanning raster to effect permanent recordation on a laminar print media, such as paper. The interface circuitry includes a buffer storage unit for receiving high speed digitized signals designating characters to be printed. Corresponding video signals are accessed within the interface circuitry and are provided to the printer. The circuit elements and timing devices define a two dimensional matrix of area locations of uniform geometry. Video signals controlling the print characteristics in a row of area locations are accessed out of memory in the interface circuitry and are serially relayed to the cursor to produce a pattern of light and dark areas in a row within the field within which the character is to be printed. Provision of video signals in this manner is repeated until the video signals have been provided for all character positions through which that row passes.