Number of Supported Controllers
The VCS Dashboard currently supports a maximum of 4 controllers (either via Bluetooth or USB). You can use any combination of Bluetooth and wired connections, but only (4) four will be active at any time. The underlying hardware can support more than 4 controllers and we are evaluating increasing the active limit in the future.
Updating Controller Software
You may periodically be prompted to update the software for your Atari controllers. To see if your controllers are up to date, navigate to the Devices page under System, and select Update Controllers from the menu on the left. Each controller will either have a status of Up to date or Update now. If a controller says Update now, simply click on it and follow the instructions on the screen.