4-Way Play, 4-player adapter
The first video game about 4-Way Play, 4-player adapter was released on May 12, 1992.
The 4-way play adapter only plugs into consoles that have the 2 controller ports side-by-side and the standard distance apart. Otherwise you will need two DB-9 extension cables with all 9 pins,to connect to adapt the 4-way play to your separated controller ports. For instance, the CDX unit has the controller ports near the front corners of the unit, and facing 'wall-eyed' instead of parallel.