Some Famiclones also use standard Atari 9-pin shaped or even 15-pin joypad connectors instead of the proprietary NES connectors, and their controllers usually offer all of the functionality of a standard NES controller and sometimes features such as "slow motion" or several autofire keys with different speeds, which are not present on the standard out-of-the-box NES joypads. Despite being physically identical to Atari 9-pin, the protocol is different: Atari uses a parallel protocol where each wire carries the status of a single button, and Famiclones uses the same 4021-based serial protocol the original NES used. Connecting standard controllers to them may result in malfunction or damage of the controller or the Famiclone itself.