The Japanese made Hirose CR7E-56DA-3.96E was the standard JAMMA connector used in almost all candy cabs in the 90's and still considered top of the line. It features a strong grip and gold plated connectors. These are always handy to have around and can be used to refresh your cab or in projects such as adapters, pass throughs, etc. 56 pin (3.96 mm pitch) as used in the JAMMA standard.
