Sega G08 coin details

I know Sega Star Trek has a freeplay rom hack available; however, at this moment, VectorLabs isn't supplying freeplay roms with their devices. I haven't spent enough time with the multi-vector boardset to determine how easy/hard it would be to convert to Freeplay.
 
I'll be taking my Star Trek Captain's Chair to Texas Pinball Festival this year; so I'll need a free play method.
 
Right now I'm considering doing a 555timer circuit to "credit up" when the start button is pressed.
 
Does anyone have any details on the coin detection circuit in the G08 designs?
I looked at the schematic and it appears there is a SR latch made out of NAND gates which feeds another latch which drives XINT to the cpu.
 
I was wondering if anyone had some details on how long the "coin in" pulse is so I can simulate it with a 555timer.
 
I can measure it myself; but am out of town at the moment. Sitting bored in the hotel room which could be used for design rather than tv watching.
                                                
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Received on Thu Dec 29 02:02:56 2011