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Hopper Opto output

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I have been playing around trying to get a compact hopper to payout but it's hit and miss I might use an arduino to take the pac drive output but in MFME if I select opto will it pulse the coin amount and will mfme still require the key pressed to acknowledge coin has been paid out?

My ideal is simple send 5 pulses from the pac drive and let the arduino handle the coin output for 5 coins returninging keypresses if it I still required?

My next question is can I use opto output on every rom or does it need to change on each rom?

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