A system for estimating the orientation of digital ink is provided which has an optically imaging pen and a processor. The mobile device determines that the detected episode is a notable finding and sends data corresponding to the notable finding to a second system. A liquid-cooled exhaust system includes a turbocharger disposed between manifold and elbow, with liquid coolant flowing from manifold to elbow through the turbocharger. When the transfer belt subassembly is inserted into a printer, the engine-controller is operative in response to data stored in the memory and sensed belt velocity and temperature data, providing adjustment of belt velocity and compensation for variations in the transfer belt speed. The basic bayonet latch mechanism is retained, so that either half of the new connector will mate with opposite sex halves of conventional BNC connectors. From the standpoint of the pointer hardware, all passes involve printing the same area of a physical page, resulting in reduced color variation across the page.