Japan starting with the PC Engine Coregrafx, immediately phasing out the original PC Engine Pad. All PC Engine and TurboGrafx-16 consoles only have one controller port; in order to use multiple controllers on the same system and play multiplayer games, a separate peripheral, known in Japan as the MultiTap and in North America as the TurboTap, was required, which allowed up to five controllers to be plugged into the system. The Cordless Multitap was also available exclusively in Japan, sold as a set with a single Cordless Pad, with additional wireless controllers available separately. Due to using different diameter controller ports, PC Engine controllers and peripherals are not compatible with TurboGrafx-16 consoles and vice versa. The TurboDuo would revert to using the same controller port that the PC Engine uses, resulting in new TurboDuo-branded versions of the TurboPad and TurboTap peripherals, known as the DuoPad and the DuoTap respectively, to be made. An official TurboGrafx-16/Duo Adapter was also produced, which was an extension cable that allowed any TurboGrafx-16 controller or peripheral to be connected into the TurboDuo console (as well as any PC Engine console as a side-effect). Many peripherals were produced for both the TurboGrafx-16 and PC Engine. The TurboStick is a tabletop joystick designed to replicate the standard control layout of arcade games from the era. Other similar joystick controllers were produced by third-party manufacturers, such as the Python 4 by QuickShot and the Stick Engine by ASCII Corporation. The TurboBooster attached to the back of the system and allowed it to output composite video and stereo audio. Hudson released the Ten no Koe 2 in Japan, which enabled the ability to save progress in compatible HuCard titles. In 1991, NEC Avenue released the Avenue Pad 3, which added a third action button labelled "III" that could be assigned via a switch to function as either the Select or Run button, as many games had begun to use one of those for in-game commands. The Avenue Pad 6 was released in 1993 in conjunction with the PC Engine port of Street Fighter II: Champion Edition, adding four action buttons numbered "III" through "VI"; unlike the three-button pad, these buttons did not duplicate existing buttons, and instead added new functionalities in compatible titles. Another six-button controller, the Arcade Pad 6, was released by NEC Home Electronics in 1994, replacing the TurboPad as the bundled controller of the PC Engine