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Museum of the Game® & International Arcade Museum® Forums
Someone here asked me about this, so I figured I'd post the info here.
Bill's site is gone, but I luckily saved local copies of the docs he created with all of the details and part numbers for how to make CP adapters to let you plug Gravitar or Black Widow game boards into a Space Duel cab, and use the Space Duel CP. These are invaluable docs.
I figured I should upload them here, for archiving. (And if anyone has any other docs from his site, we should probably get those shared too.)