James: Very briefly, the video signal actually appears on the same pins of both connectors on the Q-219. However since the hit and touch signals go to the bottom connector (S0), I usually use the top connector (S1) for video, and leave the other empty. There is no power going to either of these connectors! The video signal comes from the Q-219 card via a thin screened cable to the 5-pin DIN type monitor connector on the rear panel of the CMI III. It is here that the 16V AC is connected from a winding on the transformer, which then goes directly to power the monitor. Hope this helps, Regards, PW in sunny Sydney.