# 1.2.5 SI (Serial Interface) Resources

The SI is the interface used for exchanging data with a Controller. Each Controller is designed so that you can add a Controller Pak or a Rumble Pak, so the SI is also used for exchanging data with the Controller Pak or Rumble Pak.

In other words, the following devices are connected to the SI:

- Controller
- Controller Pak for additional data storage
- Rumble Pak for vibration

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Last Updated March, 1999