Things You'll Need
Instructions
Purchase an externally powered USB hub containing enough ports needed for use. Since the PS3 uses USB 2.0 technology, you will need to purchase a USB hub that uses 2.0 technology as well.
Power down the PS3. Unplug a USB device from one of the PS3's USB ports if necessary. Plug the USB hub into the now-available port. Plug the USB device you just removed from the PS3 into the USB hub.
Plug the USB keyboard and mouse into the available USB hub ports.