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Cartridge containing flash memory developed for use in video game consoles

A flash cartridge is one of several cartridges containing flash memory that have been developed for use in video game consoles. These cartridges enable homebrew applications and games to be used. Flash cartridges offer a means of storage for keeping the games until a user decides to run a game, which then it is copied to the cartridge's game ROM for the console to run the game as if it were a normal ROM cartridge. The game storage can be in the form of onboard flash memory on the cartridge, although more recent cartridges use external memory cards as storage in place of onboard memory, such as Compact Flash or Secure Digital memory cards. Recent flash cartridges may also use RAM instead of ROM for flashing games to run on the console as a way to offer faster loading times than what is possible on reprogrammable ROM. These cartridges remain the best known way to create and distribute homebrew games for many consoles, such as the Game Boy Advance. (another option in this case being the GBA Movie Player, which can run specially designed homebrew programs but cannot run illicit copies of commercial GBA Game cartridges due to the lack of onboard RAM for fast data access).

Games are written to the cartridge with a device called "linker". Depending on the brand of flash cartridge, the linker either connects to a link port on the console and writes to the cartridge through the console, or connects to a mini USB slot on the cartridge itself and writes directly to the flash cartridge. These linkers usually connect to a PC through a USB or parallel plug on the other end. Most linkers that connect to a link slot are capable of copying ROM information from commercial software cartridges. Some more recent flash cartridges use digital media cards (SD, MMC, CF, etc.) in which files are placed via a memory card reader.

A number of devices have been released which use popular flash memory cards such as SD and CF for storage. These have proven popular since the development of techniques to run Nintendo DS software from a GBA cartridge, due to the smaller size of DS games and the low price of these cards compared to conventional GBA flash cartridges. Examples of such devices include the M3, R4 and Supercard.

There are those that use a program called LittleWriter to write games to the cartridges. However, some people (especially people with older computers) use other software to write games to the cartridge. An example of this software is X ROM Frontend by DanSoft Australia. Some flash cartridges use specialized software designed for the specific cartridge, such as Power Writer and USB Writer software for the Flash2Advance Ultra cartridges. This presents several conflicts in regard to homebrew, as Power Writer uses a large database for proper naming and saving of games. ROMs that are not in the database (such as emulators or any other GBA homebrew) are prone to saving issues, and editing the database manually is difficult and involves the use of a hex editor. Such cartridges often have a proprietary interface, making it difficult or impossible to use operating systems other than Microsoft Windows for writing to the cartridge with a few exceptions.

Flash cartridges are also available for other Nintendo consoles, such as the DS, DSi, and the 3DS. The DSi and the 3DS have the ability to update their system firmware via the Internet, which makes it possible for Nintendo to fix the exploit that allowed the flashcarts to work, and essentially block the flashcart from loading on the console. There are also project files existing on the Internet that guide people through creating their own flash cartridge for the original Nintendo Game Boy.

The legality of flashcarts has been called into question many times, primarily by Nintendo. In a 2010 high court case, the court ruled in Nintendo's favour, and flashcarts were outlawed in the United Kingdom. In Australia, the R4 cartridge has faced legal troubles. A distributor of the R4 was fined over $600 thousand AUD, and was ordered to destroy any leftover stock they had, and an import of R4 cartridges have been seized by the Australian Border Force, as well as other assorted counterfeit Nintendo products.

Some game consoles have official flash cartridges (and official emulators) used by developers to test prototypes of their games. These cartridges are usually part of the console's software development kit and are only available to licensed developers.