Looking to do some mods and actually attempt to hook a counter to an older unit.

This is for an older circa 90s i think newgin shinobi



I see these as the only output boards but i think these are frame outputs






I hooked up an oscope to 1 common and 3 and it seems to pulse 6 volts on and off even when idle. Other pins i dont seem to get any reading. If i scope my other machines i can clearly see a pulse from 0 to 11.6 v and its a nice square wave. About 1 to 2 sec on length. Im looking to see if i have any other options. This unit did have something hooked up to 1 and 3. There was wire caps with cut wires. Not sure what would pulse 6 v every fes seconds. I do not know the frame model. Any input or ideas would be awesome. Or if anyone knew where to get a manual.

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