Editing Memory management controller (Nintendo) (section)

==Unlicensed MMCs==
Some individual ([[Homebrew (video games)#Nintendo Entertainment System (NES)|homebrew]]) and unlicensed developers have made custom MMCs for the NES, most of which simply expand the available memory.

===228===
* Manufacturer: [[Active Enterprises]]
* Games: ''[[Action 52]]'', ''[[Cheetahmen II]]''
228 is a simple bank switching MMC developed for use in the games ''Action 52'' and ''Cheetahmen II''. It does not have a nametable control bit. In the ''Action 52'' multicart, it also contains a small 16-bit register area that contains the old menu selection when exiting a game.

===GTROM===
* Manufacturer: Membler Industries
GTROM or Cheapocadabra is a self-flashable MMC developed in 2015 for the homebrew market. The board contains 512K of PRG ROM, 16K of CHR ROM, and two LEDs. While the GTROM does not contain PRG RAM, saved games are possible due to PRG ROM being flashable by NES software.

===MXM-1===
* Manufacturer: Something Nerdy Studios
* Games: ''Former Dawn''
MXM-1 is a custom MMC developed in 2022 for use in the homebrew game ''Former Dawn''. Unlike most unlicensed MMCs, it greatly expands upon the feature set of the stock NES, allowing it to use 8x1 attributes for using more colors while also featuring FMV playback, expanded audio (8 channels of PCM audio with an echo buffer, wavetable support, and smooth sinc function based interpolation) and direct access to 768M of ROM (indirectly 2.8G) and 1M of RAM.<ref>{{Cite web|url=https://somethingnerdy.com/unlocking-the-nes-for-former-dawn/|title=Unlocking the NES (for Former Dawn) – Something Nerdy Studios|date=February 9, 2022}}</ref>