Defender sync output?

Secret magic jumper trace?

If I were trying to use a K4600 with a P302 card, I don't think I can use it in Defender as I think the card is neg sync only. What card would I need to get for the K4600?
 
Defender can be set for either + or - sync depending on the state of pins 5,10 & 12 on the 7486 at loc 3A, the drawing shows a foil path to cut to reverse the sync, there is a 4.7k resistor as a pull up, if the three pins are high ground one of them to change, they are tied together.
Dick
 
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