Installation
The PS2 4 player adapter is plugged directly into an existing controller port on the console. The resulting number of ports is actually five, four on the adapter and the remaining open port on the console.
Expanded Memory
One of the features of the 4 player adapter is two additional memory card slots. These are used for other gamers to save their progress and statistics on their own cards, which are then transferred back to their home consoles.
Eight Controller Slots
Sports games as well as trivia games are designed for large groups with many people playing at one time. By plugging two 4 player adapters into the console, eight usable controller slots are created.
Correct Version
Sony released two different versions of the PS2 4 player adapter. The original is compatible with all PS2 models. A newer, slimmer adapter was created that is only compatible with the slimline model of the console.
Rumble
Regardless of which controller port is used, the 4 player adapter was designed to support the rumble feature present in all Playstation 2 dual shock controllers. This feature must also be present in the game being played.