of being restricted to one color set per 2x2 tile group), highly configurable program ROM and character ROM bank switching, and a scanline-based IRQ counter. The MMC5 supports up to 2MB total ROM, however no commercially released game exceeded 1MB. MMC6 Manufacturer: Nintendo Games: StarTropics, Zoda's Revenge: StarTropics II The MMC6 is similar to the MMC3, with an additional 1 KB of RAM which can be saved with battery backup. Famicom Disk System Manufacturer: Nintendo Games: Akumajo Dracula, Arumana no Kiseki, Ai Senshi Nicol, Big Challenge! Dogfight Spirit, Bio Miracle Bokutte Upa, CrackoutJP, Double DribbleJP, Dracula II, Falsion, Famicom Tantei Club Part II: Ushiro ni Tatsu Shōjo, Kid IcarusJP, KiKi KaiKai, Meikyuu Jiin Dababa, MetroidJP, Pro WrestlingJP, Relics - Ankoku Yousai, Risa no Yōsei Densetsu, Shin Onigashima, Super Mario Bros. 2JP, The Legend of Zelda (FDS release), The Mysterious Murasame Castle, Vs. Excitebike, Yūyūki, Zelda II: The Adventure of LinkJP, and more. The Famicom Disk System's ASIC is an extended audio chip, which supports one channel of single-cycle (6-bit × 64 step) wavetable-lookup synthesis with a built in phase modulator (PM) for sound generation similar to frequency modulation synthesis. Some cartridge conversions of Disk System games have MMCs to replace the audio channel. AOROM Manufacturer: Nintendo Games: Battletoads, Wizards & Warriors, Cobra Triangle, Jeopardy! The A*ROM MMC, named after the AMROM, ANROM, and AOROM cartridge boards that use it, was developed by Chris Stamper of Rare, and manufactured by Nintendo. It is found in games developed by Rare for Nintendo, Tradewest, GameTek, Acclaim, and Milton Bradley. It allows the PRG ROM to be switched in a single 32KB piece and uses CHR RAM for up to 256KB total ROM. Unlike other chips, it uses one screen mirroring. Third-party chips Nintendo maintained tight control over internationally-released cartridge hardware and did not allow third parties to use their own PCBs and mappers. This remained the case until late in the NES's commercial lifespan when Nintendo eased up the restrictions. As a result most third party mappers will only be found in Famicom or unlicensed cartridges. VRC1 Manufacturer: Konami, Jaleco (SS8805) Games: Exciting Boxing, Ganbare Goemon! Karakuri Douchuu, Jajamaru Ninpouchou, King Kong 2: Ikari no Megaton Punch, Moero!!, Junior Basket: Two on Two, Tetsuwan Atom VRC2 Manufacturer: Konami Games: ContraJP, Tiny Toon AdventuresJP, Akumajō Special: Boku Dracula-kun The VRC2 is a chip from Konami that allows program ROM to be switched in 8KB