1. Install Alltek MPU
2. Install "free play" roms (Burn your own, reference: http://www.pinball4you.ch/okaegi/pro_soft.html, or check with @Dave Astill to see if he has them for purchase)
3. Hack in a credit button
4. As others have said, set reply really low (I don't like this option a whole lot as the knocker is always going off scaring the heck out of me)
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