A device controls in real time the assembly of data for a bit map scanning device, such as a laser printer, under supervisory control of a host processor. The image data words are stored in a source memory and assembled in a video buffer, and automatically scanned out to the scanning device. The host...http://www.google.com/patents/US4992956?utm_source=gb-gplus-sharePatent US4992956 - Apparatus for assembling data for supply to a scanning output device
