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I have a 2 way JAMMA switcher by RiddledTV. I only used it once and it worked fine. Just don't need it anymore. Includes everything you need to hook up 2 JAMMA games at once. Asking $90 shipped anywhere in the USA.
DM me if you're interested. Pictures will be up once I am not lazy.
Source: https://www.arcade-projects.com/threads ... old.28705/