Here’s a video reverse/clean-up mod that started as W4MHQ’s “Direct Video Output” in QZX VOL.1 NO. 2. Like W4MHQ’s, this circuit uses a 75451 to do the output switching. The values of the resistors that define the pedestal and P-P video levels of the output were changed to very nearly duplicate the video signal at pin 16 of the ULA, and provides a higher (lv) P-P video level as preferred by most commercial monitors.